That's the fastest growing industry in the part of Houston where I live.
On every corner, there are institutions of money-changers -- small shops which advertise "wire money". People line up, every Friday night after getting paid -- to send U.S. dollars to their people in Mexico.
I imagine hearing the combination of a loud sucking noise and the caa-ching, caa-ching of money being flushed down the toilet.
Also looks like Napa. The main drag is morphing into a little Tiajuana with each business having an area where money can be wired to Mexico.