Abstract:
Capital gains play an important, positive role in the inter-temporal allocation of resources, but they can also be a source of economic instability. We analyze a simple overlapping-generations economy with two capital goods and irreversible investment. For each vector of initial capital/labor ratios, there is one and only one trajectory on which expectations are realized at every date. If there is any deviation from this trajectory, then there is a bubble which must burst in finite time.