880
Opinion of Souter, J.
equivalent of exemption from the terms of the subsequent statute.
The application of the doctrine will therefore differ according to the different kinds of obligations the Government may assume and the consequences of enforcing them. At one end of the wide spectrum are claims for enforcement of contractual obligations that could not be recognized without effectively limiting sovereign authority, such as a claim for rebate under an agreement for a tax exemption. Granting a rebate, like enjoining enforcement, would simply block the exercise of the taxing power, cf. Bowen, 477 U. S., at 51, and the unmistakability doctrine would have to be satisfied.24
At the other end are contracts, say, to buy food for the army; no sovereign power is limited by the Government's promise to purchase and a claim for damages implies no such limitation. That is why no one would seriously contend that enforcement of humdrum supply contracts might be subject to the unmistakability doctrine. Between these extremes lies an enormous variety of contracts including those under which performance will require exercise (or not) of a power peculiar to the Government. So long as such a contract is reasonably construed to include a risk-shifting component that may be enforced without effectively barring the exercise of that power, the enforcement of the risk allocation raises nothing for the unmistakability doctrine to guard against, and there is no reason to apply it.
24 The dissent is mistaken in suggesting there is question begging in speaking of what a Government contract provides without first applying the unmistakability doctrine, see post, at 929. A contract may reasonably be read under normal rules of construction to contain a provision that does not satisfy the more demanding standard of unmistakable clarity. If an alleged term could not be discovered under normal standards, there would be no need for an unmistakability doctrine. It would, of course, make good sense to apply the unmistakability rule if it was clear from the start that a contract plaintiff could not obtain the relief sought without effectively barring exercise of a sovereign power, as in the example of the promisee of the tax exemption who claims a rebate.
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