This paper studies the optimal two‐part tariff licensing contract for an internal patentee in a differentiated Cournot duopoly. We find that the type of the royalty payment, whether ad valorem or per‐unit, that it is optimal for the patentee depends on the kind of goods produced in the industry, more precisely on whether they are substitutes or complements and on the degree of product differentiation. We also find that licensing always increases social welfare, although it may hurt consumers.
This paper studies the macroeconomic effects of foreign aid taking into account environmental quality. We develop a dynamic equilibrium model in which public investments in both infrastructure and pollution abatement can be co-financed using domestic resources and international aid. We consider untied aid, aid fully tied to either infrastructure or abatement and aid equally tied to both expenditures. We find that when the extent to which agents are affected by environmental problems is taken into account, then, regardless of the chances of substitution between factors, transfers linked to both infrastructure and pollution abatement may be the best welfare-enhancing alternative.
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