Points out that the decline in international economic differentials makes country effects less important and sector effects more important in managing equity funds; but that there is little research on sector and sub‐sector specific risks. Presents a study of sector and sub‐sector volatility...

Using data from the stock markets of Japan, the UK and the US, this paper examines the time series properties of a price index derived from a zero net investment strategy of buying value stocks and short selling growth stocks. We use the results of this analysis to consider implications for the...