40There is an economic logic underlying the scheme which encourages a participant in that scheme to emit quantities of greenhouse gases that are less than the allowances originally allocated him, in order to sell the surplus to another participant who has emitted more than his allowance (see, inter alia, judgment of 8 March 2017, ArcelorMittal Rodange et Schifflange, C‑321/15, EU:C:2017:179, paragraph 22).
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