This model takes into account both the threat of attack and the cost of response, and chooses the optimal response from the whole prospect.

该模型综合考虑攻击的危害和响应的付出，从全局考虑对攻击选择最优的响应方式。

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The less-than-optimal response is continued full confidence in my original belief, and a refusal to accept the possibility that the new reality is true.

FORBES: When Self-Confidence Is A Bad Thing

Rather than explaining the cycle in terms of market failure, as Keynes did, real business-cycle theory views a recession as the optimal response by households and firms to a shift in productivity.

ECONOMIST: The causes of booms and busts

And the optimal policy response then is to subsidise clean technology research.

FORBES: Economists Moving Beyond Carbon Pricing