Recent policy applications of control theory methods in dynamic economic models raise the issue of imposing the transversality condition for determining a unique optimal control policy. In a stochastic framework this issue involves alternative methods of estimation, which are discussed here both...

Two type of statistical models are empirically applied to test the pattern of volatility in the exchange rate markets. One conciders the autoregressive models and tests the random walk hypothesis. The other considers the sonditional variance process and tests the hypothesis of chaotic dynamics....