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Why could rental costs for apartments/houses rise while buying prices can go up and down?
At 5%, this means you expect rents to double every 14 years. I bought a condo style apartment 28 years ago, (sold a while back, by the way) and recently saw the going rate for rents has moved up from $525 to $750, after all this time. The rent hasn't increased four fold.  If rents appear to be too low compared to the cost of buying the house, people tend to prefer to rent. On the flip side, if the rent can cover a mortgage and then some, there's strong motivation to buy, if not by the renters, then by investors who seek a high return from renting those houses, thereby pushing the price up.  The price to rent ratio isn't fixed, it depends in part on interest rates, consumer sentiment, and banks willingness to lend. Similar to stock's P/E, there can be quite a range, but too far in either direction is a sign a correction is due.