Ad Valorem versus Unit Taxes: Monopolistic Competition, Heterogeneous Firms, and Intra-Industry Reallocations

Philipp J. H. Schröder, Allan Sorensen
2010 Social Science Research Network  
Real-world industries are composed from heterogeneous firms and substantial intra-industry reallocations take place, i.e. high productivity firms squeeze out low productivity firms. Previous tax-tool comparisons have not included these central forces of industry structure. This paper examines a general equilibrium monopolistic competition model with heterogeneous firms and intra-industry reallocations. We show that the welfare superiority of ad valorem over unit taxes under imperfect
more » ... is not only preserved but amplified. The additional difference between the tools arises because unit taxes distort relative prices, which in turn reduces average industry productivity through reallocations (the survival and increased market share of lower productivity firms). Importantly, numerical solutions of the model reveal that the relative welfare loss from using the unit tax increases dramatically in the degree of firm heterogeneity. JEL-codes: D43, D61, H21, H22, H23, L11, L13
doi:10.2139/ssrn.1629136 fatcat:mfn5egkss5hbvdjthjhcssfleu