The BDS test is used to investigate whether stock returns for five companies and the FTALL index exhibit nonlinear dependence. It is found that conditional heteroscedasticity account for most of the nonlinearity of stock returns in the UK.

We examine the issue of maximal moments of four exchange rates of US, Japan, Germany and France measured relative to the British Pound. It is found that the second moment of exchange rate returns is finite, and therefore, the infinite variance stable distribution is ruled out as a candidate for...