US techies 10-times more productive than Indian

US techies 10-times more productive than Indian
If the above link didn't work, here is the gist:
Wipro's earnings is $50K per employee while top US IT companies make close to a million dollars per employee.

First some questions:

• What is the ratio of expenses vs income per employee in the US and India? There may not be such a big difference in this criteria.
• When talking about IBM, Dell etc., does the statistics include their operations in India and other countries or not?
• Does the statistics include the contract workers or consultants for US companies?
• Would American companies have the same efficiency if the cost of outsourcing increases?
  

I am fine with Indian companies generating less revenue per employee as Indian companies contribute a lot toward employment and overall spread of wealth.