Justice Breyer, delivered the opinion of the Court.
The basic question in this case is whether the franchise tax Alabama assesses on foreign corporations violates the Commerce Clause. We conclude that it does.
I
Alabama requires each corporation doing business in that State to pay a franchise tax based upon the firm's capital. A domestic firm, organized under the laws of Alabama, must pay tax in an amount equal to 1% of the par value of the firm...
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