In the US, cash transactions over a certain limit get reported to the government. Even if you manage to hoard a bunch of cash, it's surprisingly hard to spend without drawing attention to yourself.
> cash transactions over a certain limit get reported to the government.
Who reports it? So let's say I pay a bribe of $1 million for some significant but slightly illegal favor. Will the 'bribee' report it, or is it the briber?
Where did the money come from? And what will the bribee do with it? Is there a separate bribe economy, where people bribe each other and never use the money to buy houses and cars?