...Essays on the Structure of Financial Markets A thesis presented by Oved Yosha to The Department of Economics in partial fulfillment of the requirements for the degree of Doctor of Philosophy in the subject of Economics Harvard University Cambridge, Massachusetts May 1992 Abstract Chapter I: Adverse selection in an insurance market may result in low-risk individuals remaining uncovered. In the framework of a monopolistic insurance market with private information, it is shown that government entry to the market as a competitor which sells insurance, results in all potential buyers actually purchasing insurance. Chapter II: The welfare trade off between reduction in risk and enhanced market power, as depository institutions become larger but fewer, is studied. The main result is that when there are enough independent risks in the economy, it is possible to achieve high diversification through mergers between depository institutions at a very small cost in terms of greater market power. Chapter III: Firms wishing to issue securities on the stock market are required to disclose private information which might be beneficial to competitors. Issuing securities publicly is more costly than doing so privately. In equilibrium, firms with sensitive information issue securities privately, while competitors cannot unambiguously infer that the information withheld is very sensitive. This suggests that one special role of banks and venture capital in financial markets, is to provide debt and...
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