Examples of unit tax superiority for a price-discriminating monopolist

Resumen:
This paper compares the welfare effects of per-unit and ad valorem taxes in four pervasive price discrimination schemes: quantity discounts, two-part tariffs, bundling, and package size price discrimination. The paper shows by example that per-unit taxes may welfare dominate ad valorem tariffs in a market with a monopoly that maximizes profits by engaging in second-degree price discrimination.