JUSTICE KENNEDY delivered the opinion of the Court.
The principal question before us is whether the three-factor apportionment formula of the Michigan single business tax (SBT), Mich. Comp. Laws § 208.1 et seq. (1979), violates either the Due Process Clause or the Commerce Clause of the Federal Constitution. The applicability of a three-factor formula to a state income tax is well settled, but we have not considered whether a similar apportionment formula...
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