In the present paper I develop a life-cycle portfolio choice model where agents perceive stock returns to be ambiguous and are ambiguity averse. As in Epstein and Schneider (2005) part of the ambiguity vanishes over time as a consequence of learning over observed returns. The model shows that...

We show that a model with knowledge capital can generate business cycles driven by expectations of future movement in total factor productivity (TFP). These cycles are characterized by a boom in which consumption, investment, output and hours-worked all rise in advance of any movement in TFP. We...

The required degree of increasing returns-to-scale to satisfy the Benhabib-Farmer condition for local indeterminacy is too high to be empirically plausible. In the paper, we develop a natural extension of Benhabib and Farmer's (1994, Journal of Economic Theory) model by introducing aggregation...

We estimate a New-Neoclassical Synthesis business cycle model with two investment shocks. The first, an investment-specific technology shock, affects the transformation of consumption into investment goods and is identified with the relative price of investment. The second shock affects the...

We consider a record keeping cost to distinguish checking deposits from currency in a model where means-of-payment decisions and liquidity of assets are modelled explicitly. An equilibrium exists where checks are used only in big transactions while cash is used in all transactions. Higher...

We study the effect of borrowing limits on welfare in several versions of exchange and production economies. There is a "quantity" effect of a larger borrowing limit which is beneficial for liquidity constrained agents, but essentially irrelevant otherwise. There is also a ``price effect" which...