There absolutely are. The ownership of the company I work for is of a particular nationality, and every single time we have been given counterfeit bills as payment it has been from another member of said nationality, which the owner thinks is one of his “buddies.”
Every time.
And it’s usually those same guys trying to rip us off in other ways, too. I keep telling him that these motherfuckers are trying to take him for a ride about 75% of the time and it’s plainly visible from an outside perspective, but he won’t hear it. They’re his countrymen. (No, I won’t say which nationality.)