In this article we test for bubbles in the S&P 500 stock market index using monthly data over the period 1871m1-2004m6. We use fractional integration techniques, allowing for structural breaks and a nonlinear adjustment process of prices to dividends. We find a significant structural break...

In this paper we test for the presence of bubbles in the Nasdaq stock market index over the period 1994–2003 applying fractional integration techniques and allowing for structural breaks and non-linear adjustments of prices to dividends. The results show a significant structural break in 1998...

In this paper we test whether mean reversion in stock market prices presents a different behavior in bull and bear markets. We date the US bull and bear periods using Bry and Boschan (1971) algorithm. We examine the order of integration in the S&P 500 stock market index covering a daily period...