"BUT THERE WAS MORE TO THIS MORAL SPELLED OUT IN TRANSPONTINE geography than met the eye. If the Texans had the best of both worlds in decreeing that the fleshpots should remain on the Mexican side of the International Bridge—the river flowing, like the erratic progress of a tricky argument, between vice and virtue—the Mexicans had the sense of tact to keep Boys’ Town camouflaged by decrepitude, on the other side of the tracks, another example of the geography of morality. Divisions everywhere: no one likes to live next door to a whorehouse. And yet both cities existed because of Boys’ Town. Without the whoring and racketeering, Nuevo Laredo would not have had enough municipal funds to plant geraniums around the statue of its madly gesturing patriot in the plaza, much less advertise itself as a bazaar of wickerwork and guitar-twanging folklore—not that anyone ever went to Nuevo Laredo to be sold baskets. And Laredo required the viciousness of its sister city to keep its own churches full. Laredo had the airport and the churches, Nuevo Laredo the brothels and basket factories. Each nationality had seemed to gravitate to its own special area of competence. This was economically sound thinking; it followed to the letter the Theory of Comparative Advantage, outlined by the distinguished economist David Ricardo (1772–1823)."