I've recently picked up an old gangster RPG design and I'm still on the economy. It's very easy to add money into the economy, players steal from NPC players and businesses (hijacking, extortion, loansharking, etc.) but I have no concrete way to get money out of the economy. Players can purchase guns, get-away cars, bodyguards, renovate and fortify their hideouts. A player doesn't need to buy more than a handful of guns and a single gun can last for months in-game. There aren't enough fast consumables, items that are used once or twice before they leave the game. Ammunition is quickly consumed but it's relatively low-cost. Are there high-priced, quickly consumed item I can add to the game? Currently, a players cash reserve grows geometically; their money doubles faster and faster the longer they stay in-game. I need a players cash reserve to grow linearly. Adding bigger guns and faster cars works to a point but a player buying a Ferrari at ten times the price of a Cadillac will expect it to perform ten times better in-game. I can't trade cash for an equivalent item. I need to literally take money out of the game. I can increase the likelihood a Ferrari will be seized by police but players will catch on and look for low-seizure vehicles like a Fiat with a V10 under the hood. Examples from other genres would be appreciated.