A lot of this (and a lot more actually) sort of thing (corruption - tax evasion, bribery, kickbacks, underground (non-taxed)economy, patronage, etc., etc.)goes on in Mexico and many other countries. I strongly suspect it is something that's very difficult to eliminate except via a long-term concerted effort that includes effective legislation, enforcement, education and cultural change.  A daunting task to say the least. I don't see how it can be accomplished. Much of this type of corruption is/has become socially acceptable so it's not really carefully hidden (no need to). Trying to eliminate it completely could result in more veiled forms available particularly to the rich and powerful corporations, a la the USA.

I can swear there ain't no heaven but I pray there ain't no hell. _ Blood Sweat & Tears