Economics of outsourcing

This is so obvious, it's strange Joel on software had to teach me it. On the other hand, he claims someone else pointed it out to him...

The Development Abstraction Layer - Joel on Software

... if only 20% of your staff is programmers, and you can save 50% on salary by outsourcing programmers to India, well, how much of a competitive advantage are you really going to get out of that 10% savings?

Hmm.