..., systematic, independent and ordinal per se measures of market efficiency based upon market reactions separately to key developments and earnings announcements, I find that U.S. equities markets were statistically and economically significantly less efficient during the first two-three months...

... announcements. For our sample composed of more than 7'600 earnings announcements made by European firms from 15 countries between 2006 and 2014, we find that the market reactions to earnings announcements are significantly larger when the audit committee is more independent in countries with weak institutional...