Compare and contrast Fama’s 1991 article Efficient Capital Markets: II with his earlier 1970 paper Efficient Capital Markets: A Review of Theory and Empirical Work.

Compare and contrast Fama’s 1991 article Efficient Capital Markets: II with his earlier 1970 paper Efficient Capital Markets: A Review of Theory and Empirical Work.
Your objective is to critically assess the development of the subject during the 1970 to 1991 period