The equity markets have been represented by increasing volatility and fluctuations
during the past few years all over the world. The progressively more integrated financial
markets are gradually exposed to macroeconomic shocks which affect markets on a global
scale. From a common investor's point of view, the weakness of markets has lead to
increased uncertainty and volatility, as market conditions cannot constantly be evaluated with
the help of traditional financial measures and tools. Stock market participants have for a
long time relied on the concept of efficient markets and rational investors who always
capitalize on their utility and display perfect self-control, which is becoming inadequate these
days. During the recent years, cases of market inefficiency in the form of market anomalies
and irrational investor behavior have been more frequent. Theories based on ideal
predictions, completely flexible prices, and complete idea of investment decisions of other players
in the market are increasingly impractical in today's global financial markets. In the
modern finance theory, behavioral finance is a new paradigm, which seeks to appreciate and
expect systematic financial market inference of psychological decision-making (Olsen, 1998).
By understanding the human behavior, attitude and psychological mechanisms
involved in financial decision-making, standard financial models may be modified to
better replicate and explain the reality in today's developing markets.
The traditional standard finance theory is the body of knowledge constructed on
the pillars of the arbitrage philosophy of Miller and Modigliani, the portfolio theory
of Markowitz and the Capital Asset Pricing Model (CAPM) of Sharpe, Lintner and
Black (Statman, 1999). These theories believe markets to be efficient and are highly
analytical and normative. On the other hand, modern financial theory is based on the
assumption that the market actor makes decisions according to the adages of expected utility
theory and makes neutral forecasts about the future. The expected utility theory says that
an investor is risk averse and the utility function of a person is concave, that means
the marginal utility of wealth decreases. Here, the asset prices are set by rational investors
and, therefore, rationality-based market symmetry is achieved, where securities are
priced according to the efficient market hypothesis. |