Some of my favourite memories were when I played against this one kid that used to pad his income with a few extra dollars per turn, and pretend like I didn’t notice.
The best part was, he was terrible at the game, and would schooled regularily, and usually how bad you were beating him, was directly related to how much he would pad his stack. LOL…
So much satisfaction in knowing you beat him, even though he cheated.
That said, I think the most COMMON cheat is over moving aircraft. I’ve seen it too often! Especially since the release of Pacific 1940! As in the global era, there are always so many damn planes!