Just as last time, we're going to assume that costs are constant marginal costs.

就像上次一样,我们将假设成本是固定的边际成本

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We'll assume that constant marginal cost just as it was last time is equal to C.

我们假设固定边际成本,像上次一样等于C

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Given the large movements in the time allocated to these two categories, our results suggest that economists need to think hard about how individuals value the marginal time spent watching television or sleeping when computing the welfare costs of business cycles.

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Since fuel economy matters all of the time and marginal advantages in acceleration matter almost none of the time, reasonable people agree that's a constructive compromise.

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However, if Barrick only made marginal purchases over this time, it would be a bullish sign for the price of gold.

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