This dissertation comprises of three problems in the area of Political Economy and Industrial Organization. The first chapter concerns how ideologically-opposite media firms report a particular event to maximize their payoffs from advocating their ideology and strengthen reader trust which increases if the report is proximate to their beliefs. I use these facts to develop a Hotelling's linear city model of competition where the two media firms choose their respective locations which signify the impression they want to impart to its readers. I find partisan media provides accurate information while covering topics favorable to its ideology. However, for unfavourable topics, the media never provides an indifferent report, but either defends its own ideology or delivers a partially accurate report. For unfavourable issues, imparting an indifferent impression rewards a media with lowest equilibrium payoffs. I identify sufficiency conditions where readers give better assessment to news of a media located farther away from their ideology than one which is nearer. Increasing competition by the entry of a third firm does not necessarily alleviate the level of bias in the news economy. The second paper studies the pricing schedule of a monopolist while it sells a non-durable product over two time periods. The consumer's experience with the product is correlated with two possible states — good (bad) experience is more probable under a high (low) state. Given this, I study the monopolist's pricing scheme in the two periods when consumers are wishful — overly optimistic about the high state even after a bad experience. I provide a comparative study of prices in each periods when the monopolist announces prices with and without commitment when consumers are either naive or sophisticated. The final chapter provides an understanding of the efficacy of two types of trade sanctions (import and export) using a directed network model. Sanctions are common punitive measures taken by a sender player to discipline a target player. Empirical evidences in the realm of international trade show differences in the effectiveness between import and export sanctions. This paper shows that such differences can be explained by one specific centrality feature of the underlying trading network — betweenness-centrality. This measure lends insights to the trade spill-overs following sanctions underscoring why sanctions are ineffective. I highlight when a higher value of this centrality acts as a sufficient condition towards effective sanction. Based on this analysis, one can conclude whether import or export sanction will be more effective for a given trade network. / Doctor of Philosophy / Three essays spanning across topics of political economy and Industrial Organization has been studied. The first essay `Media bias in the best and worst of times' studies how ideology-motivated (partisan) media firms try to create impressions to its audience about a particular issue to increase its payoffs from either of the two sources — reader trust and advocating its ideology. This trade-off depends on the type of issue at hand which either aggravates or moderates a media's wish to generate bias in its news. I investigate not only the degree of bias for any given event, but also study how profits of media are impacted from doing so. The second chapter `Monopoly pricing under wishful thinking' investigates the pricing strategies of a seller when he sells a non-durable product to a wishful buyer twice, over two time periods. Under two possible states of the world — textit{high} and textit{low} — the buyer can derives either a good or bad experience. It is assumed that a good experience is more likely than a bad one under textit{high} state. Would the buyer re-purchase the product after having a bad experience in the first period? A wishful buyer is overly optimistic about a good experience in the future even after a bad experience in the current period. Such optimism paves the way for pricing strategies in favor of the seller under certain conditions. My aim has been to highlight these conditions and draw comparison with a pricing model with non-wishful buyers. The third chapter investigates the effectiveness of trade sanctions. Such sanctions are imposed by a sender country against a target country when the latter has taken an action which the sender disapproves — initiating domestic war, building nuclear arsenals, etc. The sanctions are enforced until the target. However, only 30% sanctions are effective in disciplining the target. This paper studies if any feature of the trade network can explain why sanctions fail and what type of trade sanction — import or export — will be optimal in any given trade network.

Clic proteins influence ethanol-related behavior in flies and other species and also mediate TGF-β signaling. These findings suggest that Clics and the TGF-β signaling pathway might work together to modulate behavioral responses to ethanol. I used the Drosophila model to address the hypothesis that TGF-β signaling is important for ethanol sensitivity. Ethanol sensitivity was blunted by multiple transposon insertions in the TGF-β receptor gene thickveins. Collectively, however, I found no consistent correlation between expression of thickveins and altered ethanol sensitivity in flies harboring transposons. I therefore also assessed ethanol sensitivity in flies with loss of function point mutations in thickveins. Ethanol sensitivity was not altered in these additional thickveins genotypes, contrary to my major hypothesis. My analysis of thickveins suggests that TGF-β signaling might influence ethanol sensitivity, but if so there must be a complex relationship between the function of this pathway and sensitivity to alcohol.

The diploma thesis "Estimation of the election results by respondents and its usage" discuss the methods of predicting the election results based on election expectations of individuals and shows how people form their expectations and how exact these expectations are. First short summary of existing methods of election results predictions and its limitations is presented - it also deals with pre-election surveys and its ambitions to predict the election results. The rest of the thesis focuses only on the prediction of the election results based on election expectations of individuals: prediction markets and aggregated estimations of respondents. Concept Wisdom of Crowds, from which both approaches originate, is presented together with concrete examples of application of the predictions based on opinions of prediction markets participants and respondents of the pre-election surveys. Results of the foreign studies confirm that the prediction markets predict the election results very well and with higher accuracy than the pre-election surveys. Current studies also positively evaluate the estimation of the election results done by respondents. Respondents are usually able to predict the election results, even several weeks before the elections. Last part of the thesis is based on my own quantitative...

Strong opposing views exist with the popularly held notion that a midlife crisis is a normative phenomenon whilst a number of international researchers assert that the evidence shows the opposite to be true. It is nevertheless acknowledged that the psychology of midlife was one of the least researched areas internationally until the 1990s when certain aspects of midlife were investigated in the United States. Findings from these studies did not include the impact of a multiplicity of factors in combination at midlife. A new approach to the study of the life course using a combination model taking account of the influence of societal structures as well as the interplay between parts has been suggested. Such an approach to midlife transition and crisis research is not known to have taken place in South Africa or internationally. A conceptual model of midlife transition and crisis was constructed from known research and relevant literature and tested using a sample of 220 individuals aged between 30 and 65. The validity of the model was established and a methodologically sound measuring instrument was validated as a more accurate measurement of midlife crisis than a self-described experience. Two factors provisionally named stagnation and death and aging anxiety were found to exist. A true midlife crisis was experienced by a minority of individuals (IS percent) but an additional 31 percent had a troublesome but manageable experience. A neurotic disposition. the absence of good parental relationships, and the use of inappropriate coping skills such as wishful thinking were in combination related to high scores on the midlife crisis scales. A qualitative study revealed that over 90 percent of respondents were able to define a midlife crisis accurately although they tended to overstate the occurrence thereof. This replicates the research findings in the United States. Stagnation was experienced more acutely by individuals aged between 40 and 50 years whilst death and aging anxiety was the primary experience for those over 50 years. The validated conceptual model and measuring instruments can be used by therapists and coaches to facilitate the counselling or coaching process with clients experiencing midlife crisis. / Psychology / D. Comm. (Consulting Psychology)

Strong opposing views exist with the popularly held notion that a midlife crisis is a normative phenomenon whilst a number of international researchers assert that the evidence shows the opposite to be true. It is nevertheless acknowledged that the psychology of midlife was one of the least researched areas internationally until the 1990s when certain aspects of midlife were investigated in the United States. Findings from these studies did not include the impact of a multiplicity of factors in combination at midlife. A new approach to the study of the life course using a combination model taking account of the influence of societal structures as well as the interplay between parts has been suggested. Such an approach to midlife transition and crisis research is not known to have taken place in South Africa or internationally. A conceptual model of midlife transition and crisis was constructed from known research and relevant literature and tested using a sample of 220 individuals aged between 30 and 65. The validity of the model was established and a methodologically sound measuring instrument was validated as a more accurate measurement of midlife crisis than a self-described experience. Two factors provisionally named stagnation and death and aging anxiety were found to exist. A true midlife crisis was experienced by a minority of individuals (IS percent) but an additional 31 percent had a troublesome but manageable experience. A neurotic disposition. the absence of good parental relationships, and the use of inappropriate coping skills such as wishful thinking were in combination related to high scores on the midlife crisis scales. A qualitative study revealed that over 90 percent of respondents were able to define a midlife crisis accurately although they tended to overstate the occurrence thereof. This replicates the research findings in the United States. Stagnation was experienced more acutely by individuals aged between 40 and 50 years whilst death and aging anxiety was the primary experience for those over 50 years. The validated conceptual model and measuring instruments can be used by therapists and coaches to facilitate the counselling or coaching process with clients experiencing midlife crisis. / Psychology / D. Comm. (Consulting Psychology)