Summary

Portrait of Arthur Goldberg Arthur Goldberg General Motors Corporation v. Washington…

A State therefore should not be enabled to put out-of-state producers and merchants at a disadvantage by imposing a tax to 'equalize' their costs with those of local businessmen who would otherwise suffer a competitive disadvantage because of the State's own taxation scheme. The disadvantage stemming from the wholesale sales tax was created by the State itself and therefore the fact that the State simultaneously imposes the same tax on interstate and intrastate transactions should not obscure the fact that interstate commerce is being burdened in order to protect the local market.
Source: Wikisource

Portrait of Arthur Goldberg Arthur Goldberg General Motors Corporation v. Washington…

Moreover, the threat of duplicative taxation, even where there is no competitor manufacturing in the consuming State, may compel the out-of-state producer to relocate his manufacturing operations to avoid multiple taxation. Thus taxes such as the one upheld today may discourage the development of multistate business operations and the most advantageous distribution of our national resources; the economic effect inhibits the realization of a free and open economy unencumbered by local tariffs and protective devices.
Source: Wikisource

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