This paper studies non-cooperative commodity taxation in a trade model with imperfect competition and trade costs. Nationally optimal tax policy simultaneously tries to correct the domestic distortion from imperfect competition and to shift rents to the home country.

When the asset market is incomplete,there typically exist taxes on trades in assets and a redistribution of revenue in the asset market that are Pareto improving. The policy is anonymous,it economizes on complexity,and it re- sults in ex post Pareto optimal allocations ; it is publicly announced...

Within an open economy, redistributive taxation makes home output scarcer, thereby improving the terms of trade all else equal. This can generate too much taxation and unemployment, and excess taxation tends to shrink, not grow, the larger the economy.

Allocations of tradable greenhouse gases (GHG) emission quotas among countries may take place according to several sharing rules corresponding to a certain perception of equity. For instance, allocating quotas in direct proportion to population, in inverse relation to GDP or according to past...