Housing Bubbles
研究了住房泡沫作为均衡现象，其中投资者仅为了转售而持有房屋，而非期待租金或效用分红。发现较宽松的抵押约束会降低泡沫倾向，但泡沫在信贷紧缩冲击下更脆弱。
We use the notion of a housing bubble as an equilibrium in which some investors hold houses for resale purposes only and not with the expectation of receiving a dividend, either in the form of rent or utility. We show that an economy with looser collateral constraints is less prone to bubbles, which, in turn, have smaller size, but are more fragile in the face of credit-crunch shocks. Our environment also allows for the existence of pure bubbles on unproductive assets. We find that multiple equilibria, in which the economy moves endogenously from a pure bubble to a housing bubble and vice versa, are possible.