39There is an economic logic underlying the scheme that encourages a participant in the scheme to emit quantities of greenhouse gases that are less than the allowances originally allocated to it, in order to sell the surplus to another participant which has emitted more than its allowance (judgment of 20 June 2019, ExxonMobil Production Deutschland, C‑682/17, EU:C:2019:518, paragraph 63 and the case-law cited).
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