Abstract
This is the first major empirical study of the German Stock Exchange and involves the analysis of monthly data for ninety German companies from 1960 to 1970. Whereas previous studies had suggested that German securities were peculiar, this analysis showed that, except for the high positive serial correlation of returns for the larger companies, German securities had very similar properties to securities elsewhere. Betas for German companies were fairly stationary over time, with the interperiod correlation for company betas ranging from 0.2 to 0.4. When the effect of measurement error was reduced, the perceived stationarity increased and a significant regression tendency towards the mean was observed. Further, it was found that the behaviour of German securities did not conflict with the domestic capital asset pricing model and indeed supported it during the bull market of the early 1960s.
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