This paper argues that current period corporate growth rates reflect c
hanges in current expectations about the long run profitability of a f
irm. This means that growth rates are likely to vary randomly over tim
e. Using data from 271 large, quoted UK firms over the period 1976-198
2, we report the existence of a positive, statistically significant an
d robust correlation between current period growth rates and a natural
measure of changes in current expectations about long run profitabili
ty, namely changes in the stock market valuation of the firm. Neverthe
less, we find that variations in corporate growth rates are difficult
to predict.