Porsche There is No Substitute! The background: In September 2005 Porsche bought 20% of its larger but less profitable German rival Volkswagen. In March 2007 Porsche bought another 19.9% (to 39.9%) and launched a takeover bid. In October 2007 the law preventing the takeover of Volkswagen was scrapped. On 20 October 2008 Volkswagen’s share price…