What's the Biggest Source of National Income for Mexico?

Sally Kohn: Joe Biden went down to Mexico 10 days ago. Mexican president Obadar said some amazing things about the US, she says. He was bragging that 40,000 Mexican nationals were now in the US without any worry at the auspices under which they entered - i.e. illegal. She asks how can such poor people do that? The answer is that our generous federal and state and local entitlements free up about $200 to $400 a month per person,. That money then goes to Mexico.