Abstract

Substantially increased international financial mobility and internal financial reforms in many countries have led to apparently increased volatility of their financial markets. This heightened volatility has sometimes been associated with rapid increases or decreases in asset values that many observers suspect contain elements of speculative bubbles and their associated crashes, not justified by rational expectations of underlying fundamentals. In addition, these possible bubbles may coincide with nonlinear dynamics beyond basic ARCH effects, thus being nonlinear speculative bubbles.