> very real phenomena like gentrification He wrote a famous post years ago about gentrification prevention called "yuppie fishbowl theory". Gentrification is

> very real phenomena like gentrification He wrote a famous post years ago about gentrification prevention called "yuppie fishbowl theory". Gentrification is caused by blocking infill development that adds new units. That's what causes existing units to get replaced. > but in the event that prices increase all over the place due to cartel-like behavior (spoiler - this happens often) That doesn't happen, landlords cannot enforce a cartel and are not motivated to. Cartels are enforced in housing /by governments/ - they are what zoning laws are intended to do. And they're the only way it can happen because they have legal force. Upzoning an area is defeating a cartel.