Price bubbles and financial markets efficiency
Abstract
This article
presents the development of investment theories after the age of the prevailing Modern Portfolio Theory and Capital Asset Pricing Model. It starts with a review of the main theoretical and empirical presumptions of the Efficient Market Hypothesis. The emergence of behavioral finance is monitored, focusing on its contribution to the investment theory and practice. A special attention is paid on the speculative price bubbles. The paper reveals the prerequisites for their emergence, the phases through which a typical price bubble passes, and the methods for calculation of the probability for their collapse. The securities with an infinite maturity are highlighted. An example for a price bubble on the Bulgarian Stock Exchange is investigated in details. Therefore the historical performance of the main Sofix stock index is examined.
Keywords
JEL Classification
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