We document an empirical puzzle for EMS exchange rates during a period in which the bands on these exchanges rates were (almost) credible, i.e. exchange rate distributions are humpshaped rather than U-shaped as predicted by the standard target zone model. We offer an explanation of this puzzle...

Macroeconomic stabilisation and foreign exchange market interventions are inves-tigated within the context of a stochastic small open economy. With money demand shocks a peg is optimal, but with goods demand shocks a nominal income target is best. With supply shocks the optimal degree of...

A democratic society in which the distribution of wealth is unequal elects political parties that are likely to represent the interests of poor people. It is in the interests of the clientele of the resulting governments to attempt to levy inflation taxes in order to erode the real value of debt...

We use the Euler equation to put forward a back-on-the-envelope rule for the global carbon tax based on a two-box carbon cycle with temperature lag, and a constant elasticity of marginal damages with respect to GDP.  This tax falls with time impatience and intergenerational inequality aversion...

Climate change must deal with two market failures, global warming and learning by doing in renewable use. The social optimum requires an aggressive renewables subsidy in the near term and a gradually rising carbon tax which falls in long run. As a result, more renewables are used relative to...

The optimal social cost of carbon is in general equilibrium proportional to GDP if utility is logarithmic, production is Cobb-Douglas, depreciation is 100% every period, climate damages as fraction of production decline exponentially with the stock of atmospheric carbon, and fossil fuel...

Climate change must deal with two market failures, global warming and learning by doing in renewable use. The social optimum requires an aggressive renewables subsidy in the near term and a gradually rising carbon tax which falls in long run. As a result, more renewables are used relative to...