I think the entire concept of price gouging could fall under the OP’s definition of folk economics.
If a stock price is high, it has a greater chance of going down than it does of going up. Conversely, if a stock price is low, it has a greater chance of going up than it does of going down.
I think because I said “monopolies / price gouging”.
I didn’t give much thought to what I was saying, but then I was just trying to guess what someone else’s point was.