The basic premise behind that idea is rents are (historically were) cheaper than a mortgage so you could take the mortgage-rent delta, invest that, and generate a return greater than the interest rate on the mortgage and end up ahead. A lot of the mortgage calculators have a 3-5yr inflection point where renting, traditionally, was always cheaper if you planned on staying somewhere for 3-5yrs and moving.
The problem is, the equation has flipped. Mortgage payments are now, in many cases, cheaper than rent and there's such a high demand for rental units in some metro areas that landlords have no problems keeping tenants increasing rent 3-10% year over year. Ideally, you could do the same arbitrage buying a house (ideally an asset that nets 0 when you sell it worst case and you get your money back) and invest the rent-mortgage delta into other assets. The problem is "unlocking" the house option. If you don't have exemplary credit, and a certain pile of cash available, banks are leery to touch you and make financing available. Ergo, you get forced into the rental market and there's a huge incentive to turn properties into rentals.
Tack on the millennial generation's hesitancy to settle down in one location and you get a set of economic conditions that encourage renting and regular rent increases.
The problem is, the equation has flipped. Mortgage payments are now, in many cases, cheaper than rent and there's such a high demand for rental units in some metro areas that landlords have no problems keeping tenants increasing rent 3-10% year over year. Ideally, you could do the same arbitrage buying a house (ideally an asset that nets 0 when you sell it worst case and you get your money back) and invest the rent-mortgage delta into other assets. The problem is "unlocking" the house option. If you don't have exemplary credit, and a certain pile of cash available, banks are leery to touch you and make financing available. Ergo, you get forced into the rental market and there's a huge incentive to turn properties into rentals.
Tack on the millennial generation's hesitancy to settle down in one location and you get a set of economic conditions that encourage renting and regular rent increases.