Renting below 'fair market price' would be one way? In the UK we have a lot of private landlords - some have borrowed heavilly and are merely expoloiting their

Renting below 'fair market price' would be one way? In the UK we have a lot of private landlords - some have borrowed heavilly and are merely expoloiting their ability to obtain a mortgage where their tenants can not and are making marginal amounts of money in the process (often much less than if they simply invested what cash they have in a tracker fund). Some have inherited a property or are renting out buildings they bought twenty years ago where the amount of rent they charge is multiple times out of sync with their actual costs. So long as all of these people can say they are only charging 'fair market' prices then the problem persists.