I'm not an economist. But here is my arm-chair philosophizing about what is happening. To combat the economic crisis we started printing a lot of money. This had two effects: the interest on savings went way down, and the loans became very cheap. Having money = bad, having debts = good, at least for those who can carry the burden. This was done in order to incentivize investing, thus growing the economy. Obviously, that worked: property price and valuations went way up. But those are driven by the future-promise of debt repayment. The moment we stop printing the money, people will get wise and try to sell off those assets again. Because then having money is cheaper than having debt. So now there's a bit of problem: we can't keep printing money faster than the economy grows due to hyperinflation, but we can't /really/ stop doing so either because people will sell off their debts in order to cash in on cheap investments. This to me, seems problematic.