I would help if you could formulate exactly one though. I was thinking of making a cool video on it. “10 most popular economic myths” is rather catchy, you see.
I think that one can be tied in with the ‘spending is good, savings/hoarding is bad’ one. Because when government spends (either via taxes or via inflation), people think of the new jobs as positives.
People believe banks acted and act in a ‘free market’ environment. They think loans are based on savings and that this naturally collapses because of greed. This is why they blame the free market for the banking crisis and not the government cartel that it really is.