Greater intervention by the public sector is often proposed as a solution to the increased speculation and excessive price volatility through to characterize today's competitive world financial system. However, before any ambitious policy responses can be contemplated, the question whether asset...

Several recent papers have presented evidence from foreign exchange and other markets suggesting that the log of excess returns can be characterized as first-order integrated processes (I(1)). This contrasts sharply with the "conventional" wisdom that log prices are integrated of order one I(1)...