My wife, Nettie, and I could not believe what we were seeing. Roberto, our favorite Mexican employee for four years, had sent the money he made back to Mexico to build a bakery. We had no idea he had done that. We knew he, like most Mexican workers in the United States, sent a significant portion of his earnings home once a month. He must have sent more than the 40 percent that is typical. His family took the money and built a bakery so he would have a business to go home to in his village of Tepanzacoalco in...