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This dissertation investigates consumer valuation of car characteristics with the special focus on two non-physical attributes of an automobile such as safety and comfort. Consumer valuation of automobile attributes is of interest to car manufacturers who supply the characteristics, consumers who purchase them, and policy makers who regulate the automobile. This study uses two approaches to accomplish this goal. The first one is the traditional hedonic method which calculates consumer willingness to pay for measurable components of safety and comfort, whereas the second one combines these components into comfort and safety indexes. It is argued in this study that these individual components, which can make a car safer or more comfortable, are evaluated by consumers in the broader context of safety and comfort before the final choice is made. It is also argued that this aggregation can be justified by a high degree of multicollinearity between various car attributes which has been observed in the previous hedonic studies of the automobile market. Included here is also a comprehensive discussion of econometric problems associated with the characteristics approach. The computational part is based on the new and the most extensive data set used in the hedonic literature of the automobile market. The study concludes by presenting the set of price and income elasticities of demand for the safety and comfort related variables. The results of both methods indicate that many car attributes are Giffen goods, which implies a positive relationship between the marginal willingness to pay and quantity purchased. The main reasons for these findings could be attributed to the impact of the government quality standards affecting automobiles and the shortcomings of the hedonic procedure (treatment of nonlinearities). / Ph. D.

We consider the applicability of the Revelation Principle under the possibility of collusive behavior among players in some Bayesian framework. In doing this, since the coalition formation itself suffers information asymmetry problems, we assume that the coalition is formed if the colluding parties can successfully find some coalitional mechanism whose outcome is a set of messages in the original mechanism. Recently Cremer [1986] proposes a coalitional mechanism in the framework of the well known Vickrey-Clark-Groves mechanism. We assume that the agents successfully collude if they can find coalitional a mechanism such that (i) coalitional mechanism is incentive-compatible and (ii) the payoff of this mechanism is strictly Pareto-improving in terms of the agent’s expected utility. Our analysis is undertaken in a one principal/two agent framework. We first ünd that the Revelation Principle is still applicable in the pure adverse selection model. We then extend this result to a model with both adverse selection and moral hazard aspects. Finally, we consider a three-tier principal/supervisor/agent hierarchical organization, as in Tirole (1986). We explicitly present the coalitional mechanism as a side-contract between the supervisor and the agent. We apply the previous result of applicability of the Revelation Principle and characterize the coalition-proof mechanism. We find that the principal can design an optimal collusion free contract with some additional cost by specifying proper individual and coalitional incentive-compatibility conditions and individual rationality conditions. Moreover, we find that the results of Tirole (1986)’s paper hinge on the fact that he considers only “hard,” verifiable, information. / Ph. D.

Includes bibliographical references (leaves 134-137)

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Historically, the Consumption Capital Asset Pricing Method (C-CAPM) has performed poorly in that estimated parameters are implausible, model restrictions are often rejected and inferences appear to be very sensitive to the choice of economic agents' preferences. In this study, we estimate and test the C-CAPM with Constant Relative Risk Aversion (CRRA) using time series data from Germany, South Africa, Britain and America during relatively short time periods with the latest available data sets. Hansen's GMM approach is applied to estimate the parameters arising from this model. In general, estimated parameters fall outside the bounds specified by Lund & Engsted (1996) and Cuthbertson & Nitzsche (2004), even though the models are not rejected by the J-test and are associated with relatively small minimum distances.

This dissertation studies topics in international macroeconomics. In the first chapter, I develop a heterogeneous agent model of a small open economy and studies how households differ in their responses to aggregate productivity and interest rate shocks. Poor households display stronger consumption responses to an aggregate productivity shock because they are more likely to be constrained in liquid assets. In contrast, rich households display stronger consumption responses to an interest rate shock because they are more likely to be unconstrained in liquid assets. When the economy experiences a sudden stop, defined as transitory contractionary shocks to productivity and the interest rate, the interest rate effect neutralizes the productivity effect. As a consequence, the sudden stop generates consumption-income elasticities that display little variation along the income distribution, similar to a permanent shock. My finding captures the observed behavior of households in the Mexican Peso Crisis of 1994. In the second chapter, I study a small open economy subject to a borrowing constraint which experiences stochastic volatility in its output endowment. I find that volatility shocks induce substantial changes in borrowing by households, in excess of the precautionary savings response. Household responses to volatility shocks increases the standard deviation of borrowing, but not the standard deviation of consumption, suggesting small welfare costs. Stochastic volatility increases the frequency of financial crises in a decentralized economy that overborrowsdue to a pecuniary externality, but not a socially optimal economy. In the third chapter, I introduce income heterogeneity into a small open economy model with an occasionally binding collateral constraint. Income heterogeneity generates poor households that borrow up to the constraint to smooth over their income shock. This differs from representative agent models that require a depressed aggregate state for the representative household to interact with the constraint. As a consequence, the model displays a higher average marginal propensity to consume which generates a higher volatility of aggregate consumption. The model with income heterogeneity fails to generate sudden stops. This occurs as the income shock generates rich households that are able to consumption smooth throughout contractions. In the fourth chapter, I trace the path between a benchmark representative agent model and a benchmark heterogeneous agent model. Heterogeneous agent models typically introduce idiosyncratic income risk, a financial friction in the form of a borrowing or non-negativity constraint, and recalibrate the impatience of households. This paper studies the effect of each term. With the minimal financial friction that households cannot starve, complete markets fail, but income risk has no significant effect on the aggregate response of consumption to an endowment or interest rate shock relative to a representative agent benchmark. Heterogeneity and significant financial frictions generate empirically realistic marginal propensities to consume, but fail to alter the aggregate consumption response. Decreasing the impatience of households is necessary to significantly alter aggregate responses to endowment and interest rate shocks.

Lam, Lai Fong. / Thesis (M.Phil.)--Chinese University of Hong Kong, 2007. / Includes bibliographical references (p. 47-50). / Abstracts in English and Chinese. / ABSTRACT --- p.ii / ACKNOWLEDGEMENTS --- p.iv / LIST OF TABLES --- p.vi / LIST OF FIGURES --- p.vi / CHAPTER / Chapter I --- INTRODUCTION --- p.1 / Chapter II --- LITERATURE REVIEW --- p.6 / Chapter III --- THE EXCHANGE RATE REGIMES OF THE FOUR NIES --- p.10 / Review of the Exchange Rate Regimes of the Four NIEs / Frankel-Wei Regression / Chapter IV --- METHODOLOGY --- p.19 / Measurement of the Monetary Independence / Specification of Model / Chapter V --- EMPIRICAL RESULTS --- p.2? / Unit Root Test / The Endogeneity Test / Cointegration Test and Error Correction Model / Chapter VI --- CONCLUSIONS --- p.37 / APPENDICES --- p.41 / BIBLIOGRAPHY --- p.47 / TABLES --- p.51 / FIGURES --- p.59

Thesis (PhD)--Stellenbosch University, 2014. / ENGLISH ABSTRACT: In the first essay of this thesis, a medium scale DSGE model is developed and estimated for the South African economy. When used for forecasting, the model is found to outperform private sector economists when forecasting CPI inflation, GDP growth and the policy rate over certain horizons. In the second essay, the benchmark DSGE model is extended to include the yield on South African 10-year government bonds. The model is then used to decompose the 10-year yield spread into (1) the structural shocks that contributed to its evolution during the inflation targeting regime of the South African Reserve Bank, as well as (2) an expected yield and a term premium. In addition, it is found that changes in the South African term premium may predict future real economic activity. Finally, the need for DSGE models to take account of financial frictions became apparent during the recent global financial crisis. As a result, the final essay incorporates a stylised banking sector into the benchmark DSGE model described above. The optimal response of the South African Reserve Bank to financial shocks is then analysed within the context of this structural model.