Types of stock market efficiency
He also uses the nature of impact of information asymmetry on stock prices as a factor to identify three types of market efficiency. The first type is the Weak-Form. View Stock Market Efficiency Research Papers on Academia.edu for free. The research consist of fourdifferent types of M&A namely horizontal, conglomerate Moreover, Eugen Fama extended and refined the theory with a definition of three forms of market efficiency (Fama, 1970) - the weak form, the semi-strong form