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This Ph.D. thesis consists of three essays on Labour Economics and the Economics of Education, having the goal of contributing to the scientific discussion and shed new light on a number of empirical questions. The remaining of the chapter presents a general motivation for the study, together with the main findings and policy implications, which are fully developed throughout the thesis. Motivation There is an ongoing debate in Economics of Education on the merits and drawbacks of school choice as opposed to a community-based model, where schools only serve the local neighbourhood. Advocates of school choice base their arguments on the economic theory of market efficiency. First, a more market oriented education system should improve the match between pupils and schools. In this sense, allowing families to select schools on the basis of their preferences and teaching needs should result in an improvement in the average academic achievement. Moreover, increased choice should help breaking the link between residential and school segregation induced by a community-based model, with wealthier families living in more affluent neighbourhoods also attending the best schools. The benefits of choice should be even more pronounced for low income children who are typically segregated in poor neighbourhoods served by low quality schools (Gibbons et al., 2008). Second, school choice is believed to have beneficial effects also on school performance. Indeed, community-based schools operate in an almost monopolistic market, implying little incentives to innovate and improve teaching performance. In a world 1 Introduction where parents have strong preferences for quality, a choice based model would increase competition among schools with the ultimate result of boosting performance (Hastings et al., 2005; Burgess et al., 2009; Gibbons and Silva, 2011). On the other hand, scholars in favour of a community-school model claim that teachers are more likely to perform well in a more stable environment with relatively low turnover. Moreover, greater choice would replace the link between neighbourhood and school segregation with sorting across schools on the basis of family background characteristics. In this sense, they advocate that it would be more desirable to stick to a community-based model and improve the performance of lower quality schools via redistribution of resources. The first two chapters of this thesis aim at shading additional light on the advantages and disadvantages of school choice models. Specifically, I explore the effects of a programme introduced in the UK, which aimed at increasing choice among low income families, on both students' choices and school behaviour. The third chapter addresses a different empirical question. Typically, when workers are rewarded on the basis of team effort the possibility arises that individuals free ride. However, past literature emphasised the importance of externalities when groups of agents are concerned. Specifically, group effects such as social pressure or shame may be strong enough to completely offset free riding (Kandel and Lazear, 1992; Mas and Moretti, 2009). Using Italian social security data on private sector employees, the last chapter contributes to the existing literature by exploring externalities in workers' shirking, which I recover from information on sick leave episodes.

This thesis consists of three independent but thematically related papers exploring the income determination process in African labour markets from spatial and sectoral perspectives. Using long-run household panel data from rural Tanzania, chapter 2 investigates the extent to which education can explain migrants' income and consumption gains. We expect that the higher return to schooling at the destination primarily drives migrants' gains, suggesting that those who cannot afford the cost of schooling cannot reap the benefits of migration. We find that education indeed plays the role, but that it does not appear to be a major factor in limiting the internal migration as a source of raising income and consumption. Exploiting data drawn from urban household panel surveys in Ghana and Tanzania, chapter 3 investigates how rural-to-urban migrants' earnings compare with those of natives in urban labour markets. The chapter attempts to identify the growth of migrants' earnings at the destination (assimilation), making a distinction between wage and self-employed migrants. We find that wage-dependent migrants would achieve higher lifetime earnings if they entered a self-employed sector from their arrival, conditional on individuals' attributes and the varying returns to those attributes across urban residents. The evidence points towards the importance of capital constraints in a decision to start a business. Using firm-level data of manufacturing and retailing from the Enterprise Surveys conducted in seven Sub-Saharan African countries, chapter 4 attempts to improve our understanding of enterprise performance in urban Africa by investigating three aspects of firms' productive structure: technology, total factor productivity (TFP), and firm size. We find that the technology is similar between sectors, that retailing firms are smaller and less capital intensive but not, on average, ones with lower TFP, and that TFP differences are primarily within sectors. All these findings might point towards the importance of factor prices in characterising the industrial structure in urban Africa.

Diss. Uppsala : Univ., 2004.

This dissertation comprises three essays on the allocation of labour and capital in a large developing country, Indonesia. In the first essay, I examine the impact of the 1998 East Asian recession on child schooling outcomes in Indonesia. Using panel data on 7-15 year-olds, I exploit the heterogeneous impact of the recession across urban communities as measured by the variation in rice price increases, under the assumption that communities where rice prices increased the most were those where real wages declined the most. I find that for the youngest children (aged 7-12 years) there is a large negative impact of higher rice prices on school attendance and no effect on labour market participation. For older children (aged 13-15 years), schooling enrolment does not respond to rice prices but labour market participation declines sharply in the worst-hit communities. I find no evidence of adverse long-term consequences on human capital formation. In the second essay, I test the hypothesis that there exists a significant earnings differential between similar workers in the formal and informal sectors. Using panel data on salaried and self-employed individuals, I find that after controlling for firm size and individual-specific heterogeneity, there is no formal sector earnings premium, except in the public sector. The results are robust to the presence of unpaid family workers, measurement error, and non-random attrition in the survey. This questions the commonly held belief that labour markets in developing countries are segmented because of legal institutions that protect high formal sector earnings. In the third essay, I estimate the effect of a large exchange rate depreciation on the performance of importers. The ability to manage volatility in the cost of imported inputs is likely to depend on a firm's access to external sources of finance as well its ability to hedge against exchange rate movements. Using data from a census on Indonesian firms, I find that while domestic importers face lower value-added due to a rise in their costs of production, foreign-owned importers fare better: they are more likely to sustain higher value-added, hire more labour and use more materials than domestic owned firms. This suggests another channel through which FDI can add value to a firm in a developing country, particularly with the increasing importance of trade in intermediate goods.

We introduce signals to search models of two-sided matching markets and explore the implications for efficiency. In a labour market model in which firms can advertise wages and workers can choose effort, we find that advertisements can help overcome the Diamond paradox. Advertisements fix workers' beliefs, so that workers will react if firms renege on advertisements. Firms then prefer to advertise truthfully. Next, we consider a market with two-sided heterogeneity in which types are only privately observable. We identify a simple condition on the match output function for agents to signal their types truthfully and for the matching to exhibit positive assortative matching despite search frictions. While our theoretical work implies that the efficiency of matching increases as information technology spreads, empirical matching functions typically suggest that it declines. By estimating more general matching functions, we show that the result of declining efficiency can partly be attributed to omitted variable bias.

In this thesis I explore three topics in labour economics, using micro data from South Africa and Tanzania. South Africa suffers from extremely high income inequality, in part as a result of comprehensive Apartheid-era racial discrimination. The first topic explores possible explanations for the extremely large earnings differences across different types of employment for black South Africans, using the KwaZulu-Natal Income Dynamics Study data. I analyse the relative importance of individual ability and institutions, including public sector wage setting and trade unions, in determining earnings. My results suggest that human capital explains much of the earnings differentials within the private sector, including union premiums, but cannot explain the large premiums for public sector workers. Self-employment is very common in urban Tanzania but, unlike South Africa, survey data show that there are large overlaps in the distribution of earnings in private wage employment and self-employment. This suggests that self-employment represents a viable alternative to wage employment in small, low productivity firms for the majority of urban Tanzanians. In chapter three I build an equilibrium search model of the urban Tanzanian labour market to explain the choice of wage and self-employment and the variation in earnings across and within these sectors. In the final topic I explore the effect of education on earnings in Tanzania. Estimating the returns to education has stimulated much recent work in applied econometrics as researchers advance their understanding of the effect of individual heterogeneity on the possibility of estimating the returns to education. In my attempt to purge estimates of the return to education of the influence of individual heterogeneity, I use an education reform in Tanzania as a natural experiment that provides exogenous variation in education. When using Ordinary Least Squares (OLS) I find high and strongly convex, increasing returns to education. My best attempt at separating out the effect of individual heterogeneity suggests that returns are still high but that they may actually be concave.

There are four parts to this thesis: the first chapter analyses the structure of leisure in couples with particular emphasis on joint leisure. We take a structural approach and model the household as a two-stage decision making unit. The findings suggest that couples see joint leisure as a distinct good from private leisure. Specifically when a household decides to have more leisure, almost 40 percent of this increase is allocated to joint leisure as opposed to only 8 to 15 percent allocated to male private leisure. Furthermore, couples prefer to spend leisure together (synchronisation) relative to spending time independently, giving joint leisure the largest weight in the utility function. The findings further suggest that demographics can play a large role in determining the patterns of spousal leisure, with ethnicity and job characteristics being important factors. Finally, when analysing weekend time use patterns, there is evidence to suggest that Saturdays should be distinguished from Sundays as approximately 41 percent more joint leisure is observed on Sundays. The second chapter of the thesis begins our examination of the UK income taxation reform in 1990. The UK went from a system of joint taxation to independent taxation of couples and this reform may have had important implications for households. Across countries, there is a large variation in the income tax treatment of couples. Over the last three decades, many countries have undergone reforms in their tax systems, some have moved from joint to independent taxation, some from independent to joint, while others have begun the practice of allowing couples to choose the system they prefer. This chapter aims to give an overview of the tax treatment of couples and outlines the differences across countries, with particular emphasis on the tax reform in the UK. The third chapter investigates the UK income taxation reform in 1990 and examines how the change from a system of joint to independent taxation of couples has shifted women's relative earning potentials in the household, and how this in turn has led to changes in intra-household assignable clothing expenditures. I apply my method to a sample of UK couples with children and the findings of this chapter show that an exogenous increase in women's income relative to their spouse significantly and substantially increases female clothing expenditure and decreases male clothing expenditure ceteris paribus. However an increase in relative female earnings does not necessarily mean that children will do better relatively. The final outcome may depend on the type of transfer in question. In addition, there is evidence that the final allocations of expenditures on each partner and children may depend significantly on distribution factors such as spousal relative incomes, age gap and educational gap, despite the fact that these variables do not impact on preferences nor on budgets directly. This provides further evidence against the unitary framework in favour of the collective approach and the sharing rule interpretation of how households make decisions in practice. The final chapter of this thesis examines the effects of the tax reform in 1990 with particular emphasis on female labour supply. A method of clarifying the concept of a spouse's individual net income under a joint tax regime is proposed and following the methodology of Blundell et al (2007), the labour supply elasticities for both male and female are estimated. The analysis is extended further to include children in the model and the results show that both the number of children and their age are highly significant for women's labour supply and to a smaller extent also for men. Testing the income pooling hypothesis, the unitary model is not rejected. However, the results strongly reject the hypothesis that distribution factors have no effect on labour supply. The results also suggest that for the group of women affected, the reform generated two opposing effects on their labour supply: a positive effect from an increase in net wage and a negative effect from an increase in bargaining power. On balance, we find that a typical female decreased her labour supply by approximately 2.6 hours per week, yet she still experienced a 22 percent increase in her net income.

This thesis consists of five stand-alone chapters empirically evaluating questions relating to the life cycle of natural resource extraction. We use three different data sets to shed light on the local impacts of natural resource booms and busts. In chapter 2 to 4 we use the household budget survey of Kazakhstan to explore the impacts of the oil boom on the local population. In the second chapter, we explore the distributional effects of the oil boom and show that average household income increased and income inequality decreased. In the third chapter we study how the increase in average income was perceived by the local population and find that households' satisfaction with income decreased. In the fourth chapter we study how the boom affected households' expenditure and show that the likelihood that households pay tuition fees for tertiary education increased. In chapter 5, we explore the long-term impacts of a negative labour demand shock following the coal mine closures in the UK. To do this we construct a new data set containing the location of all active coal mines since 1981 and link it to the UK census. We find that the dramatic lay off of miners since 1981 was associated with a persistent reduction in female labour force participation in the affected districts. In chapter 6, we study the determinants of drilling costs and their impact on the real price of oil using a new global data set on the number of exploration wells drilled and costs of drilling. To do this, we propose a structural model of the upstream sector in the oil and gas industry. The model allows us to decompose the variation in the reduced form errors of the estimated VAR into three structural shocks, and estimate the dynamic responses of the variables in the system to these shocks. We confirm that the upstream sector of the oil and gas industry is subject to increasing costs. But we do not find that the real oil price is permanently affected by shocks to costs of drilling.

This thesis employs two new approaches to explain some of the important debates in two key economic fields: labour market economics and macroeconomic studies related to current account imbalances. Chapter 1, Chapter 2 and Chapter 3 begin a new strand of research by introducing the normal inverse Gaussian (NIG) distribution to describe unobserved heterogeneity in the labour market. The NIG distribution can be represented as a normal variance-mean mixture with the inverse Gaussian (IG) distribution as the mixing distribution. A 0.01% subsample of the 1980 US Census, comprising all men between 18 and 65 who are in the labour force, as well as a comparable sample from Ghana, is used to show that the NIG distribution provides a better fit of the log earnings function than the normal distribution. The prediction of right skewness of the log earnings distribution arising from the log normal skill Roy selection model is rejected in favour of left skewness. The thesis then extends the model to describe the distribution of log earnings conditioned on education. The same two datasets (US males and Ghanaian males) are used for the empirical analysis. We find that, once the unobserved heterogeneity is accounted for, the return to education is almost flat for lower levels of education in Ghana, and then increases for education levels greater than ten years. One of the key differences between the two datasets is that skewness and unobserved heterogeneity is a function of education for Ghana but not for the US. The NIG framework is found to be a useful tool to model this heterogeneity. Chapter 4 uses a model that allows for a rich structure of age effects similar to those predicted by the life cycle theories to argue that the demographic shifts are partly responsible for the sustained rise in the US current account deficit and the rapid increase in China's current account surplus in the last decade. However, demographics do not have an impact on the long run equilibrium or level of current accounts. Rather, they are important determinants of the short run adjustment of current accounts to their equilibrium levels. In the next twenty years, the demographic shifts are likely to push towards further current account positive adjustments in China and current account negative adjustments in the US. Developing the infrastructure, financial markets, policy tools and regulatory settings to be able to cope with the excess capital flow remains an urgent task.