are generally indeterminate. But, when firms differ exogenously in the cost of intermediation services, the tax on savings … intermediation should be zero. Also, when household time and payment services are substitutes in transactions, the optimal tax rate … equilibrium when banks have monopoly power, justifying a Pigouvian tax in this case …

economic theory prescribes that the advertising volume can be optimally reduced by levying a tax on ads. However, making use of … recent advances in the theory of Industrial Organization and two-sided markets we show that taxing ads may be … counterproductive. In particular, we identify a number of situations in which ad-adverse consumers are negatively affected by the tax …

concerning the health effects of the consumption of fat and of healthy goods. The level of the fat tax is determined through … fraction of the fat tax proceeds is “earmarked” to reduce health insurance premiums while the remaining fraction finances a … welfare, anticipating the induced political equilibrium. We show that the fat tax in the political equilibrium is always lower …

There exists a wide variety of tax treatments of pensions across the world. And the reasons for such a range of regimes …