In the early 1990s, U.S. tycoon Ross Perot criticized the proposed North American Free Trade Agreement (NAFTA) for threatening to suck U.S. jobs south. In the 15 years since the trilateral agreement, another giant sucking sound is coming – but from the flow of pesos across the Rio Grande and over the Atlantic into the coffers of foreign banks that are charging millions of Mexicans usurious rates that can top 100 percent. Jorge Sanchez is feeling the effects. A modestly paid government employee in his 40s, Sanchez fell into the plastic trap. Trying to close the gap between a stagnating...