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Trading certificates makes the sector's reduction cheaper because savings are made

  • A.where they cost least
  • B.in the largest plants first
  • C.only in the newest plants
  • D.in equal measure everywhere

Answer: A

Correct answer: where they cost least

Every plant faces a different marginal cost of saving energy, and trading lets the sector’s total obligation be met by whoever can meet it most cheaply, the others paying them to do so. The physical reduction is the same as under a rigid per-plant rule, and the cost of achieving it is lower - which is the whole argument for a trading scheme.

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