The equilibrium of capital and equilibrium market prices are derived for a world economy with a unified securities market, mobile capital, no uncertainty, and varying tax rates on different sources of income in each country. The paper then characterizes optimal tax rates for a small country in this setting, focusing on the peculiar incentives created when the before-tax rate of return differs among securities due to differences in their typical tax treatment. Copyright 1986 by American Economic Association.

This paper shows that when uncertainty is taken into account explicitly, taxation of corporate income can leave corporate investment incentives, and individual savings incentives, basically unaffected, in spite of the sizable tax revenues collected. In some plausible situations, such taxes can increase efficiency. The explanation for these surprising results is that the government, by taxing capital income, absorbs a certain fraction of both the expected return and the uncertainty in the return. While investors as a result receive a lower expected return, they also bear less risk when they invest, and these two effects are largely offsetting.

Under the U. S. tax law, taxable income differs systematically from economic income when there is inflation. For example, nominal interest payments and nominal capital gains are taxable or tax deductible, and depreciation allowances are based on historic rather than replacement costs. Therefore, even fully anticipated inflation can have real effects. The purpose of this paper is to investigate to what degree an increase in the inflation rate, given these differences between taxable and economic income under existing tax law, ought to change corporate investment and financial policy, and cause capital gains or losses to existing owners of corporate equity.

In a Federal system of government, each unit of government decides independently how much of each type of public good to provide, and what types of taxes, and which tax rates, to use in funding the public goods. In this paper we explore what types of problems can arise from this decentralized form of decision-making. In particular, we describe systematically the types of externalities that one unit of government can create for nonresidents, through both its public goods decisions and its taxation decisions. The paper also explores briefly what the central government might do to lessen the costs of decentralized decision-making.