The 2011 Alumni Innovation Survey found there were 39,900 active companies, such as Google and Hewlett-Packard, that could be traced back to Stanford, which would make it the 10th largest economy in the world.

US-based Stanford University graduates have created an estimated 5.4 million jobs since the 1930s and generate annual revenues of $2.7 trillion.

The 2011 Alumni Innovation Survey found there were 39,900 active companies, such as Google and Hewlett-Packard, that could be traced back to Stanford, which would make it the 10th largest economy in the world.

About 18,000 firms created by alumni are headquartered in California around the university that have aggregate sales of about $1.3 trillion and employing more…