Many studies have examined the level of risk perceived by cyclists when they are being passed by motor vehicles (e.g., Beck et al., 2021; Rasch et al., 2022) and others have reported that drivers with negative attitudes towards cyclists self-report higher levels of driver aggression towards cyclists (e.g., Delbosc et al., 2019; Fruhen & Flin, 2015; Haworth et al., 2018). However, self-reported behaviours may not reflect a driver's observable behaviour (Fruhen et al., 2019). Lamondia and Duthie (2012) proposed that LPD is an indicator of the driver's degree of respect for a cyclist but other driver factors may also be important. Little is known about how accurately drivers canjudge lateral passing distance (Haworth et al., 2018) or whether some unsafe passes could simply reflect poor driver understanding of cyclist needs when sharing roadways. The general finding that LPDs are lower when there are parked cars or oncoming vehicles (Rubie et al., 2020), suggests that drivers may leave inadequate LPDs if they perceive that moving into the opposite side of the road poses a risk to themselves or their vehicle. Rasch et al. (2022) is one of the few studies to measure drivers' perceptions of the risk to themselves in overtaking cyclists. Some studies have examined how different motor vehicle speeds influence perceived risk of the passing motor vehicle for cyclists (Apasnore et al., 2017; Garcia et al., 2020; Llorca et al., 2017; Rasch et al., 2022) or drivers (Rasch et al., 2022), generally finding that cyclists perceive higher motor vehicle speeds are more hazardous. This paper examines (1) whether negative attitudes towards cyclists influence perceptions ofrisk: to the cyclist in passing events, (2) the factors associated with driver perceptions of the risk to themselves, and (3) if increases in motor vehicle speed are associated with higher levels of perceived risk to the cyclist and driver in the passing event. [From: Introduction]

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Previous research has shown time and risk preferences to be important factors when explaining a variety of behavioural patterns, such as smoking, obesity and savings behaviour, while we focus on the effect on financial behaviour and financial well-being. Financial behaviour is measured using a twelve-item scale with individuals’ self-stated reports of for example savings behaviour and credit card usage. To measure financial well-being, we construct a measure consisting of individual’s self-perceived current and future financial condition. Time preferences are revealed by matching questions and we use different ways of measuring risk, both self-stated risk attitudes and risky choices revealed by gambles. Our results show that increased short term patience, leads to better financial behaviour. Also, individuals with higher financial risk attitudes, exhibit better financial behaviour. Contradictory, regarding actual decisions, the impact is different and being loss averse, has a positive impact on financial behaviour. Financial well-being is on the other hand influenced positively by both more short and long term patience. It also increases with general and financial risk attitudes. Risky choices do not have an impact on financial well-being. We show that risk preferences are affected by time preferences. Having a high short term discount rate leads to higher financial risk attitudes and increases the likelihood of being loss averse, while it decreases the likelihood of being risk averse. Our results are important for understanding heterogeneity in financial decision making and the financial well-being it fathers. This quantitative study is based on a large, representative sample of the Swedish population (N=2063). / Tidigare forskning har visat att tids- och riskpreferenser är viktiga faktorer när man försöker förklara olika beteendemönster, såsom rökning, övervikt och sparande. Vi fokuserar på tids- och riskpreferensers effekt på finansiellt beteende och finansiellt välmående. Finansiellt beteende mäts genom tolv frågor, där individer exempelvis anger hur ofta man sparar eller använder kreditkort. För att mäta finansiellt välmående, konstruerar vi ett mått baserat på individens självupplevda nuvarande och framtida ekonomiska tillstånd. Tidspreferenser mäts genom “matching questions” och vi använder flera riskmått, både individers angedda riskattityder och riskfyllda val som visas genom riskfyllda spel. Våra resultat visar att ökat tålamod på kort sikt leder till bättre finansiellt beteende. Dessutom uppvisar individer med högre finansiella riskattityder bättre finansiellt beteende. I motsats till detta uppvisar dock, vid faktiska beslut, förlustaversiva individer bättre finansiellt beteende. Finansiellt välmående påverkas, å andra sidan, positivt av både kort- och långsiktigt tålamod. Det förbättras också av både högre generella och finansiella riskattityder. De riskfyllda valen påverkar inte finansiellt välmående. Vi visar att tidspreferenser påverkar riskpreferenser. Att ha högre tålamod på kort sikt leder till högre finansiell riskattityd och ökar sannolikheten för att vara förlustaversiv, medan det minskar sannolikheten att vara riskaversiv. Våra resultat är viktiga för att förstå heterogen finansiell beslutsfattning och det finansiella välmående det leder till. Denna kvantitativa studie baseras på ett stort, representativt sampel av den svenska befolkningen (N=2063).

While the saving environment has become more complex in recent years, so has the demand for individual activity. Important impetuses include financial deregulation, globalization, technological change, and reformed pension systems. Financial institutions can provide financial advisory services to help their customers to obtain positive net benefits by avoiding mistakes and using economies of scale, and they can also attract and maintain their customers by creating strong relationships. Earlier studies show that the incentive structure often leads to advice that is not to the benefit of the customers. In addition, not all customers seek and receive advisory services. The objective of this study is to increase our understanding of the relationship between the bank advisor – customer relation and the bank customer’s saving behavior. The scope of the study is to analyze relevant theories and develop a model that includes financial advisors as a mediator of saving behavior, and to understand the relational attributes that can affect saving behavior. Also, the characteristics of customers with a relational versus a transactional exchange form with the bank are explored. Given the problems of establishing causality, the scope is also to understand the impact of the relationship and, in particular, face-to-face advisory meetings on saving behavior. The analysis is mainly carried out with the help of customer data – both objective bank register data and subjective survey data – while the advisor characteristics are to a lesser extent part of the data material. Five studies are carried out using various methodologies, i.e., theoretical review and model development, probit and multinomial logistic regressions, difference-in-difference regression, and structural equation modelling. In addition, a case study is made analyzing dyads of customers and advisors in order to explore theoretical assumptions. Economics and relationship marketing are used to explain saving behavior with transactional, interimistic relational, and enduring relational exchange forms (Paper 1). Several major findings emerge in the quantitative analysis: First, the attributes are longer and stronger, the more relational the exchange form is (Paper 2). A second finding is that relational attributes also surface in transactional exchange, a finding that requires further research to be understood in more detail (Paper 2). Third, among relational attributes, duration and context have the largest total effects on saving behavior, while trust is a mediating variable (Paper 5). Fourth, not only demographic and socioeconomic factors can predict whether customers use the relational exchange form; psychological factors, such as saving motives and risk attitudes, are also predictors. Results are clearly different for women and men (Paper 3). Finally, financial advisory meetings are found to increase saving volumes and saving products held in stock. The largest effects are found for young customers with low wealth and low profitability to the bank, i.e., customers who initially have low activity levels and thus create a large potential (Paper 4). Limitations include endogeneity problems in general, and selection bias in particular, making it difficult to establish causality, and internal and external validity. Future research should focus on data management, especially building time series with enhanced methods to adjust for selection bias. In addition, studies to better understand the transactional exchange form are needed, as well as studies that deepen the definition of relational exchange, not least when alternative channels to face-to-face meetings include mobile banking and internet banking, and the digitalization of  the social know-how of financial advisors. Managerial implications include understanding the relational attributes that affect saving behavior, such as context, duration, and trust. Also useful to know are the factors that can help to predict the probability of a customer’s having a transactional or relational exchange form, i.e., including demographics, socioeconomics, psychology, and gender, to see how channels and customers can be better matched. Policy implications include using the model in this study to match relational attributes to the degree of financial literacy, since the risk of misselling is particularly large for relational-oriented customers with low financial literacy. / Samtidigt som sparandet har blivit mer komplext under senare år, har behovet av individens egen aktivitet ökat. Viktiga drivkrafter för denna utveckling har varit finansiell avreglering, globalisering, teknisk utveckling och reformerade pensionssystem. Finansiella institutioner kan erbjuda finansiell rådgivning för att hjälpa kunderna erhålla positiv nettonytta genom att de då kan undvika att göra vanliga misstag och kan få skalfördelar med ökad tillgång till information. Genom att skapa starka kundrelationer kan dessa institutioner också använda rådgivningen för att attrahera och behålla kunder. Tidigare studier visar att incitamentsstrukturen ofta leder till att rådgivningen missgynnar kunderna. Det är heller inte alla kunder som söker och får tillgång till rådgivning. Syftet med denna avhandling är att öka förståelsen för sambanden mellan bankkundens sparbeteende, finansiell rådgivning och relationen mellan bankrådgivaren och kunden. I avhandlingens omfång ingår att analysera teorier, utveckla en modell som inkluderar finansiella rådgivare som intermediärer till sparbeteende samt förstå de relationsattribut som kan påverka sparbeteendet. Dessutom görs jämförelser mellan kunders karaktäristika utifrån deras utbytesform. Med hänsyn tagen till svårigheterna att fastställa kausalitet ingår även att förstå hur relationen i allmänhet, och rådgivningsmöten i synnerhet, påverkar sparbeteendet. Analyser görs med hjälp av kunddata, både objektiva registerdata och subjektiva enkätdata, medan karaktäristiska för rådgivarna i mindre utsträckning finns med i datamaterialet. Fem studier utförs som använder olika metoder, såsom teoretisk genomgång och modellutveckling, probit- och multinomiala logitregressioner, ”difference-in-difference” regressioner samt struktur-ekvationsmodellering. Inledningsvis gjordes också en fallstudie som analyserade dyader av bank-kunder och rådgivare för att undersöka teoretiska antaganden. Det framkommer att national-ekonomi och relationsmarknadsföring tillsammans kan användas för att förklara sparbeteende med hjälp av tre utbytesformer (transaktion, interimistisk relation, djupgående relation) (Art. 1). Ju mer relation utbytesformen innehåller, desto längre och större är relationsattributen (Art. 2). Relations-attribut finns också representerade i transaktionsutbytet, ett resultat som kräver ytterligare forskning (Art. 2). För det tredje framkommer att bland relationsattributen är duration och kontext viktigast för att förklara sparbeteendet, följt av förtroende som är en intermediär variabel (Art. 5). För det fjärde framkommer att förutom demografiska och socioekonomiska faktorer är psykologiska faktorer, såsom sparmotiv och riskpreferenser, prediktorer för utbytesform. Resultaten är markant olika för män och kvinnor (Art. 3). Slutligen, givet endogenitetsproblem, syntes finansiella rådgivningsmöten öka sparvolymer och antal produkter som bankkunder använder. De största effekterna observeras för unga, personer med låga förmögenheter samt personer med låg lönsamhet för banken, d v s kunder som initialt har en låg aktivitetsnivå men som utgör en potential (Art. 4). Begränsningar i studierna handlar om endogenitetsproblemen i allmänhet, och selektions-svårigheter i synnerhet, vilka gör det svårt att fastställa kausalitet och vilka begränsar extern och intern validitet. Framtida forskning bör därför fokusera på datahanteringen genom att bygga upp tidsseriedata och utveckla metoder som justerar för selektionsproblem. Dessutom behöver transaktionsattributen studeras. Samtidigt är studier som fördjupar förståelsen kring relationen viktiga, inte minst som alternativa kanaler till mänskliga rådgivningsmöten – såsom mobilbank och internetbank – snabbt vinner gehör i bankerna och bland kunderna.     Avhandlingens implikationer för bankledningar inkluderar ett ramverk som kan användas för hur relationen och dess attribut påverkar sparbeteendet, såsom duration, kontext och förtroende. Vidare är det användbart att förstå de faktorer som predicerar sannolikheten att kunden har en relations- eller transaktionsutbytesform, och de inkluderar demografi, socioekonomiska faktorer, psykologi och genus, inte minst som behovet att bättre matcha kanaler med kunder ökar. För politiska beslutsfattare kan avhandlingens modell användas för att matcha relationsattribut till graden av finansiell förmåga, inte minst som risken för ”misselling” är särskilt stor för relationsorienterade kunder med låg finansiell läsförmåga. / <p>QC 20150327</p>

This thesis investigates the choices under risk in the framework of non-expected utility theories. One of the key contributions of this thesis is providing an approach that allows for a complete characterisation of Cumulative Prospect Theory (CPT) preferences without prior knowledge of the reference point. The location of the reference point that separates gains from losses is derived endogenously, thus, without any additional assumptions on the decision maker’s risk behaviour. This is different to the convention used in the literature, according to which, the reference point is preselected. The problem arising from imposing the location of the reference point is that the underlying preference conditions might not be alligned with the predictions made by the model. Consequently, it is difficult to verify such a model or to test it empirically. The present contribution offers a set of normatively and descriptively appealing preference conditions, which enable the elicitation of the reference point from the decision maker’s behaviour. Since these conditions are derived using objective probabilities, they can also be applied to settings such as health or insurance, where the continuity of the utility function is not required. As a result, the obtained representation theorem is not only the most general foundation for CPT currently available, but it also provides further support for the use of CPT as a modelling tool in decision theory and fi…nance. Another contribution that this thesis can be credited with is an application of rank-dependent utility theory (RDU) to the problem of insurance demand in the monopoly market affected by adverse selection. The present approach extends the classical model of Stiglitz (1977) by accounting for an additional component of heterogeneity among consumers, the heterogeneity in risk perception. Speci…fically, consumers employ distinctive probability weighting functions to assess the likelihood of risky events. This aspect of consumers’' behaviour highlights the importance that the probabilistic risk attitudes within the RDU framework, such as optimism and pessimism, have for the choice of insurance contract. The analysis yields a separating equilibrium, with full insurance for a sufficiently pessimistic decision maker. An important implication of this result is that any low-risk individual who sufficiently overestimates his probability of loss will induce the uninformed insurer to o¤er him full coverage, thereby, affecting the high-risk type adversely. This outcome is consistent with the recent empirical puzzle regarding the correlation between ex-post risk and insurance coverage, according to which, agents with low exposure to risk receive a larger amount of compensation. By providing an explanation of this pattern of individual behaviour, the current work demonstrates that theory and practice of insurance demand can be reconciled to a greater extent. The paper also provides a behavioural rationale for policy intervention in the market with RDU agents, where the initial distortions in contracts due to unobservable risks are aggravated by the non-linear weighting of probability of a risky event.

Made available in DSpace on 2016-12-23T14:38:03Z (GMT). No. of bitstreams: 1 Dissertacao de Anna Beatriz Carnielli Howat Rodrigues.pdf: 617372 bytes, checksum: e427988ae1c37beaa0f608a4312d61ef (MD5) Previous issue date: 2010-12-08 / Coordenação de Aperfeiçoamento de Pessoal de Nível Superior / Propõe-se que a percepção da imprevisibilidade de recursos durante a infância promove o desenvolvimento de um modelo mental de imprevisibilidade, precursor da preferência pela obtenção imediata do recurso (desconto do futuro) e propensão ao risco, como forma de maximizar as chances de obtenção destes recursos percebidos como imprevisíveis. A aparente irracionalidade destes comportamentos (desconto do futuro e propensão ao risco) podem ser interpretadas como respostas adaptativas a ambientes imprevisíveis produzidas por mecanismos cognitivos de processamento de informações sobre o ambiente, selecionados ao longo da evolução humana. Esta dissertação teve por objetivo investigar relações existentes entre dimensões de imprevisibilidade familiar na infância, propensão ao risco e desconto de futuro. Participaram 394 pessoas, sendo 158 adultos em conflito com a lei que já haviam passado pela prisão (média de idade=34.23 anos; dp=10.17), 122 jovens universitários (M=19.26; dp=2.06) e 114 mulheres com idade superior a 40 anos e escolaridade a partir de ensino médio (M=51.19; dp=8.64). Trabalhamos com a hipótese de que percepções de imprevisibilidade familiar na infância favoreceriam escolhas de curto prazo e maior propensão ao risco. Utilizamos o procedimento de escolhas monetárias de desconto do futuro e as Escalas de Imprevisibilidade Familiar na Infância (EIFI) e de Propensão ao Risco (EPRE), validadas para a população brasileira nos dois primeiros artigos desta dissertação. Ambas as escalas apresentaram solução fatorial de quatro fatores com índices de confiabilidade satisfatórios para fins de pesquisa. Os resultados do terceiro artigo apontaram relação parcial entre os construtos de risco e imprevisibilidade, todavia, baixa relação com o valor de desconto do futuro. Os grupos diferiram em relação ao desconto do futuro (ANOVA), à propensão ao risco (retirados os efeitos da renda MANCOVA) e à imprevisibilidade familiar na infância (retirados os efeitos da idade e da renda MANCOVA). O grupo que exibiu maiores médias de imprevisibilidade, também foi aquele com maiores taxas de desconto do futuro (adultos em conflito com a lei), indicando alguma relação entre estas variáveis, principalmente no domínio de recursos financeiros. Variáveis de risco, todavia, comportaram-se de maneira não esperada com a imprevisibilidade e o desconto 12 do futuro. Concluímos, a partir da abordagem multidimensional utilizada, que as relações entre os construtos não ocorrem de forma linear como proposto inicialmente. Apontamos para a possibilidade de ampliação do estudo destas relações considerando modelos não lineares e refinamento das hipóteses evolucionistas / It is proposed that the perception of resource unpredictability during childhood promotes the development of a mental model of unpredictability, precursor of the preference for the immediate attainment of the resource (future discount) and for risk-taking, as a way of maximizing the chances of obtaining those resources perceived as unpredictable. The apparent irrationality of those behaviors (future discount and risk-taking) could be interpreted as adaptive responses to unpredictable environments produced by cognitive mechanisms of information processing on the environment, selected over human evolution. This study aimed to investigate relations between childh od family unpredictability dimensions, risk-taking and future discount. It included 394 people: 158 adults in conflict with the law that had already been in prison (mean age = 34.23 years; sd=10.17), 122 college students (M=19.26; sd=2.06) and 114 women above 40 years old and at least high school concluded (M=51.19; sd=8.64). We hypothesized that perceptions of childhood family unpredictability would favor short term choices and greater risk-taking. We used the procedure of monetary choice to evaluate future discount, the Childhood Family Unpredictability Scale (EIFI) and Specifc Risk-Taking Scale (EPRE), validated for the Brazilian population in the first two papers of this work. Both scales showed factor structure of four factors with satisfactory reliability indexes for research purposes. The results of the third paper indicated partial relation between the constructs of risk-taking and unpredictability, however, low relation of those and future discounting. The groups differed in relation to future discount (ANOVA), risk-taking (removed the effects of income MANCOVA) and family unpredictability (removed the effects of age and income MANCOVA). The group that exhibited the highest means of unpredictability also exhibited higher rates of future discount (adults in conflict with the law), indicating some relationship among these variables, especially in the area of financial resources. Risk-taking variables, however, behaved in an unexpected way with unpredictability and future discount. We concluded, considering the multidimensional approach, that relations among the constructs may not be linear as originally proposed. We indicate the possibility of expanding the study of these relations considering nonlinear models and refinement of evolutionary hypotheses. 14 Key-words: unpredictability, risk attitudes, Evolutionary Psychology, psychological measure, Life History Theory

Cette thèse aborde la question de la fiabilité du temps de transport. L’étude de la fiabilité du temps de transport trouve ses sources dans le fait que, dans biens des situations, le temps de transport n’est pas certain, mais aléatoire. De nombreux évènements peuvent en effet modifier le temps de transport prévu par les opérateurs ou espéré par les usagers. Par ailleurs, lors de l’évaluation socioéconomique de projets d’investissement en infrastructure de transport, il peut exister un arbitrage entre gain de temps et gain de fiabilité. Or, comme la fiabilité est encore à l’heure actuelle, difficilement intégrable dans ce type d’évaluation, ces projets d’investissement voient leur rentabilité collective sous-estimée conduisant à leurs reports. Il émerge ainsi trois problématiques majeures relatives à l’étude de la fiabilité du temps de transport : sa mesure, sa valorisation monétaire (i.e. la disposition à payer des individus pour améliorer la fiabilité du temps de transport) et enfin, sa prise en compte dans les analyses coûts-avantages. Un premier chapitre permet d’adapter les mesures usuelles de la fiabilité du temps de transport appliquées dans le cadre du transport routier, aux modes de transport collectif (fer et aérien plus particulièrement). Nous proposons également une nouvelle mesure de la fiabilité, le Delay-at-Risk (DaR) inspiré de la littérature financière. Le DaR est une transposition de la mesure de la Value-at-Risk (V aR) à l’économie des transports. Cette mesure est plus utile du point de vue des usagers pour la planification des trajets avec correspondance que les autres mesures. Le deuxième chapitre a pour principal objectif de déterminer la disposition à payer des individus pour améliorer la fiabilité du temps de transport. Nous proposons un cadre théorique inspiré de la théorie de la décision en univers risqué à partir duquel nous définissons la préférence des individus à l’égard de la fiabilité (i.e. reliabilityproneness) ainsi que la prudence. Nous développons des nouvelles mesures de la fiabilité du temps de transport, exprimées comme des primes de risque : la reliability-premium et la V OR. La reliability-premium détermine le temps de transport maximum supplémentaire qu’un individu est prêt à accepter pour supprimer l’intégralité du risque sur le temps de transport. La V OR, quant à elle, se définit comme la disposition maximale à payer d’un individu pour supprimer l’intégralité du risque sur le temps de transport. Par ailleurs, nous établissons également les conséquences sur la valeur du temps (V TTS) et de la fiabilité (V OR), de la prise en considération de l’attitude à l’égard du risque sur le temps de transport des usagers (aversion et prudence). Le dernier chapitre de cette thèse a pour objet d’intégrer la fiabilité dans les évaluations socioéconomiques de projet d’investissement et plus particulièrement dans la détermination du surplus des usagers. Nous mettons en exergue un effet de diffusion des gains de fiabilité par rapport aux gains de temps. Ainsi, nous proposons des recommandations quant à l’arbitrage entre les projets générateurs de gain de temps et de gain de fiabilité en fonction des valeurs monétaires du temps (V TTS) et de la fiabilité (V OR). / This thesis deals with the issue of travel time reliability. The study of travel time reliability emerges from the fact that in many situations, travel time is random. Many events can change the travel time forecasted by operators or expected by users. Moreover, a tradeoff may exist between time and reliability benefits when evaluating socio economic appraisal of transport infrastructure. However, since reliability is still difficult to integrate in this type of evaluation, investment projects’ collective profitability is underestimated and often postponed. Thus, three main issues of travel time reliability analysis emerge: measurement, monetary valuation and implication for cost benefit analysis. This thesis is organized in three chapters. The first chapter adapts the measure of travel time reliability typically used in the road transport context to the collective modes (rail and air, in particular). We also develop a new reliability measure: the Delay-at-Risk (DaR). DaR is an implementation of the Value-at-Risk (V aR) measure into the transport economic framework. The DaR seem to be relevant and understandable information for the users, especially to plan their travel and avoid missing their connections. The main objective of the second chapter is to define the users’ willingness to pay to improve travel time reliability. We present a theoretical framework based on decision theory under risk. We introduce the concept of reliability-proneness (i.e. travel time risk aversion) and prudence. We develop new measures of travel time reliability expressed as risk premium: the reliability-premium and V OR. The reliability-premium is the maximum amount of additional travel time that an individual is willing to accept to escape all the risk of travel time. The V OR is defined as the maximum monetary amount that an individual is willing to pay to escape all the risk of travel time. Furthermore, we also establish the link with attitudes towards risks of travel time (aversion and prudence) and the impact of the value of travel time (V TTS) and the value of reliability (V OR). The final chapter of this thesis integrates reliability in investments project’s socioeconomic appraisal. More particularly, it allows to determine users’ surplus valuation. We highlight a diffusion effect of reliability benefits with regard to travel time benefits. Thus, we propose recommendations regarding the tradeoff between projects that generate time benefits compared with reliability benefits, according to the monetary values of travel time (V TTS) and reliability (V OR).

Pour les entreprises concernées par le phénomène du vieillissement, le rapport entre la structure par âge de la main d’œuvre, les profils des salaires et de productivité est un élément clé abordé dans cette thèse. Le premier chapitre passe en revue divers concepts théoriques et décrit les résultats empiriques en ce qui concerne le profil des salaires et de productivité en fonction de l’âge. L’étude empirique présentée dans le chapitre deux évalue le profil de productivité marginale selon l'âge. Nous considérons la main d'œuvre à la fois par qualification (peu qualifiés, hautement qualifiés) et par âge (jeunes, âge moyen, âgés). Nous estimons, sur des données françaises d'entreprises, une fonction de production de type CES emboîtée qui autorise une substitution imparfaite entre les différentes catégories de travailleurs. Parmi les résultats principaux, nous avons trouvé que la productivité du travail par l’âge dépend étroitement de la catégorie de qualification et du secteur d’activité des travailleurs. Le chapitre trois analyse le comportement des juniors et des seniors, en particulier leurs attitudes face au risque, la confiance en soi et la propension à entrer en compétition. Pour cela, nous avons organisé une expérience avec des banquiers suisse. Nous trouvons que, bien que les deux générations ne présentent ni des différences considérables quant à leurs attitudes face au risque, ni face à l’ambiguïté, les seniors font preuve d’une propension plus élevée à entrer en compétition. Cette décision est clairement influencée par l’information sur l’âge des autres participants. De plus, les deux générations maximisent leurs profits dans les groupes équilibrés en termes d’âge. / The relationship between the age structure of workforce, earnings and productivity profiles is a key issue for the enterprises facing the phenomenon of ageing. The present thesis addresses these issues in the following order. The first chapter reviews different theoretical concepts and recent empirical findings concerning the profile of earnings and productivity by age. The empirical study presented in the chapter two aims at estimating the actual profile of labour productivity across different age groups. In this purpose, we differentiate the workforce simultaneously by skills (low-skilled, high-skilled) and by age (young, middle-aged, old). Using French firm-level data, we estimate a production function with a nested constant-elasticity-of-substitution (CES) specification in labour, which allows the imperfect substitution between different age and skill categories of workers. Among the main findings, labour productivity by age highly depends on skill category of workers and the sector of activity. The third chapter involves the behavioural analysis of the workforce composed of juniors and seniors. In particular, we study workers’ risk attitudes, self-confidence and propensity to enter the competition. In this purpose, we perform an artefactual field experiment with the employees of a Swiss bank. We find that, although there are no significant differences in attitudes towards risk and ambiguity between both generations, seniors have higher propensity to enter the competition. The information on age of others players clearly has an impact on this decision. Moreover, the profits of both generations are maximised, when a pool of competitors is balanced in terms of age.

This thesis deals with the risks in residential social services. In particular, it focuses on the attitudes of residential care workers to hazardous situations First, attention is paid to attitudes and dilemmas of social workers, trends in the current definition of mental disability, self-perception of risk in the lives of people with intellectual disabilities, residency services and documentation of risks, the methods used in the work with risk. In the research section are presented and discussed results of a survey in the Czech Republic, which was attended by 40 people from five social service facilities (particularly in the Central Czech Republic). Respondents facility had the opportunity not only to respond to the items, but also to express its attitude on the issue. On the basis of this survey are designed to further methodological procedures for research in this area, and use the work in special education practice. Keywords: intellectual/learning disability, work with risk, residential care, documentation, work with risk attitudes and dilemmas workers