It's a liquidity problem for the whole marketplace. There's only a limited amount of space to rent in the first place. When people get older and don't need as m

It's a liquidity problem for the whole marketplace. There's only a limited amount of space to rent in the first place. When people get older and don't need as much space, they don't move to a smaller unit to free up space for people who need more space for growing families. So you end up with one person living in a space for four people and four people living in a space for one person.