A company's entry into (or exit from) a major share index provides a special opportunity to examine price discovery. In an efficient market, we expect the demand curve to remain horizontal and to be unaffected by external events that do not communicate new information to the public, even if...

Sell-side company analysts are most likely to be closest to a company’s financial health, will be privy to new information, and run models that process new information into meaningful expected changes to future earnings per share. Importantly, data vendors collate analyst’s individual Eps...