Comparative-statics results for financial options are often assumed to hold for real options. But the effects of higher volatility need not be increased value and postponed investment. This depends on signs of correlations and what parameters are held constant. For real options, the...

Carbon dioxide emissions may cause global warming. But own emissions have negligible effects for a small nation, which may thus regard carbon taxes as distortionary. Such taxes may have other effects, however. When research and development (R&D) has positive external effects, carbon taxes may...

Lund (2002a) showed in a CAPM-type model how tax depreciation schedules affect required expected returns after taxes. Even without leverage higher tax rates implied lower betas when tax deductions were risk free. Here they are risky, and marginal investment is taxed together with inframarginal...

Even for fully equity-financed firms there may be substantial effects of taxation on the after-tax cost of capital. Among the few studies of these effects, even fewer identify all effects correctly. When marginal investment is taxed together with inframarginal, marginal beta differs from average...

Most firms use one discount rate applied to expected net after-tax cash flows. The need to adjust for differences in risk, other than leverage, is commonly neglected. There can be substantial effects of taxation on after-tax risk when there are depreciation deductions. Among the few studies of...

The literature on taxation of rents from nonrenewable resources uses different theoretical assumptions and methods and a variety of empirical observations to arrive at widely diverging conclusions. Many studies use models and methods that disregard uncertainty, investigating distortionary...

During the past two years similar petroleum tax reforms have been proposed in Norway and Denmark. Both were based on results on neutral taxation derived by Boadway and Bruce (1984) and Fane (1987). In this paper the main features of the proposals are presented, and important problems of...

We discuss the existence of a pooling equilibrium in a two-period model of an insurance market with asymmetric information. We solve the model numerically. We pay particular attention to the reasons for non-existence in cases where no pooling equilibrium exists. In addition to the phenomenon of...

The literature on taxation of rents from nonrenewable resources uses different theoretical assumptions and methods and a variety of empirical observations to arrive at widely diverging conclusions. Many studies use models and methods which disregard uncertainty, investigating distortionary...

Levy and Arditti (1973) introduced depreciable assets into the Modigliani and Miller (1958) model, and analyzed the implications for the cost of capital. Assuming that the firm reinvests indefinitely to maintain a constant expected cash flow, they found that depreciation increases the cost of...