128Nevertheless, their right to property is not called into question by the introduction of such a measure. No economic operator can claim a right to property in a market share, even if he held it at a time before the introduction of a measure affecting the market, since such a market share constitutes only a momentary economic position exposed to the risks of changing circumstances (Case C-280/93 Germany v Council [1994] ECR I-4973, paragraph 79, and Swedish Match, paragraph 73). Nor can an economic operator claim an acquired right or even a legitimate expectation that an existing situation which is capable of being altered by measure taken by the Community institutions within the limits of their discretion will be maintained (Case 52/81 Faust v Commission [1982] ECR 3745, paragraph 27, and Swedish Match, paragraph 73).
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