Extreme increases in rent are extortion. It's abusing vendor lock-in. Moving costs a lot of time and money, so people will feel forced to pay more for a house t

Extreme increases in rent are extortion. It's abusing vendor lock-in. Moving costs a lot of time and money, so people will feel forced to pay more for a house than they would have paid if they were looking. The landlord is abusing their position of power. In plenty of countries, you can fight rent increases if you feel they're not justified.