Past empirical research indicates that, in an increasing number of countries, certain accounting parameters affect the course of stock prices. Moreover, that this effect becomes stronger with time. The present study examines the impact of earnings and book value in the formulation of stock prices on a sample of 38 companies listed in the Athens Stock Market during the 1996-2008 period. The resulting evidence suggests that the joint explanatory power of the above parameters in the formation of ???ck prices increases over time. However, the impact of earnings is diminishing, compared to the book value, while investors strive towards analysing the fundamental parameters of businesses. Finally, multicollinearity was traced between the earnings and book value variables.