We develop a model of commodity tax competition with monopolistically competitive internationally mobile firms, transport costs, and asymmetric country sizes. We investigate the impacts of non-cooperative tax setting, as well as of tax harmonization and changes in the tax principle, in both the...

The optimal income tax problem, since it requires self-selection constraints which define nonconvex feasible sets, is one of the many problems in economics for which randomization in the solution may be desirable. For a two-class economy. we characterize the optimal random tax schedules and we...

The optimal income taxation problem has been extensively studied in one-period models. This paper analyzes optimal income taxation when consumers work for many periods. We also analyze what information, if any, that the government learns about abilities in one period can be used in later periods...

Most analyses of optimal income taxation make restrictive technical assumptions on preferences (such as single-crossing) and only derive properties of welfare-maximizing tax schedules. Here, for an economy with any finite numbers of groups and commodities, Pareto efficient tax structures are...

This study examines ICT adoption among 3,759 Colombian manufacturing firms to identify factors that are pertinent to the adoption and usage of ICT at the firm level. This article also attempts to ascertain if the determinants of a firm's ICT adoption vary across the firm size. Our major findings...

A genome-wide association study (GWAS) of educational attainment was conducted in a discovery sample of 101,069 individuals and a replication sample of 25,490. Three independent single-nucleotide polymorphisms (SNPs) are genome-wide significant (rs9320913, rs11584700, rs4851266), and all three...

This study examines ICT adoption among 3,759 Colombian manufacturing firms to identify factors that are pertinent to the adoption and usage of ICT at the firm level. This article also attempts to ascertain if the determinants of a firm\'s ICT adoption vary across the firm size. Our major...