Gotham creates one villain and attracts another. For one reason or another, all citizens feel like they need to stay in that hell. Batman keeps running his inherited skyriser board business. Nobody move. Perfect. The Joker robs a bank, and is going to burn a 10 foot high pile of banknotes. Which doesn't make sense because the remaining banknotes would just deflate. The Joker would have to target the gold reserves. The Bank can just print new bank notes once the Joker is done. Still, the banknote burning nonsense is dwarved by the nonsensical citizens of Gotham - Who actually choose to live there.