Read this article about activist shareholders pressurizing Yahoo: http://www.forbes.com/sites/adamhartung/2016/03/30/yahoo-case-study-in-why-activist-investors-exist-and-succeed/#30bee16728a6. out if the identified four mechanisms of corporate governance (ownership concentration, board of directors, executive compensation and the market for corporate control). Which two mechanisms are most apparent in this article? Elaborate. 200-400 words