Is Mexico overstating their income from remittances?
Rodolfo Tuiran, who's with Mexico's Social Development Secretariat, says that that country might be overstating how much it receives from its citizens abroad (98% of whom are in the U.S.) The previous figure was $16.6 billion, but he thinks the accurate figure is more like $9.65 billion. See "Debate grows on whether Mexico overestimates money sent home by migrants" for the details.
Whether what he says can be trusted remains open. They could be trying to downplay the amount to avoid it being a PR issue or to avoid it being taxed by the U.S.