Activist Investor Carl Icahn thinks Apple Inc is already worth over $1 trillion but others on Wall St. think it will take a few more years for the iPhone maker’s stock value to get there. With Apple’s stock market value ballooning this week beyond $700 billion, larger than Switzerland’s gross domestic product, activist investor Icahn said the technology company’s shares should be trading at $216 apiece, equivalent to a market capitalization of about $1.26 trillion. Icahn’s opinion implies an increase of about 70 percent from Thursday’s closing price of Apple’s stock.