Stanford alumni's companies would be 10th largest economy

If companies founded by Stanford University alumni formed an independent nation, it would be the 10th largest economy in the world.

Graduates of 'The Farm' have created an estimated 5.4 million jobs and generate annual revenues of nearly $3 trillion dollars.

California alone is home to 18,000 firms created by Stanford alumni.

The information comes from a study was done by two Stanford professors.