In this paper we extend Harberger's analysis for tax incidence by allo
wing for joint production. Our analysis shows that, with regard to cor
porate income tax, most of Harberger's results are still valid qualita
tively, although quantiatively they are different. With regard to comm
odity taxation, the incidence of the tax on factor rewards depends cri
tically not only on relative factor intensities, but also on relative
commodity intensities in each productive activity. In this framework,
we also examine the effects of taxation on commodity composition and r
elative commodity prices.