Be courteous when buying or selling, and use commonsense.

应礼让时，购买或出售，并运用常识。

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But of course, use your commonsense here too.

当然，使用常识在这里太。

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That is why the next wave of environmental policymaking will need to employ commonsense tools such as cost-benefit analysis, and make greater use of flexible, market-based instruments such as emissions-trading, rather than the tired command-and-control approach favoured by most greens.

ECONOMIST: Energy and the environment