...经济指标的相关性不断升高，但是从单个项目来看这些渠道自身的波动性太大，与主要经济的相关性不强，受随机冲击（random shocks）的影响比较大，尤其是政策影响。
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Mr Coates likens this condition to the state of "learned helplessness" identified in the 1960s by Martin Seligman, a psychologist who delivered random electric shocks to dogs constrained in harnesses.
科茨先生把这种情况比作“习得性无助”，由马丁•塞利格曼在1960年定义的。
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Tones and foot shocks were administered separately at random intervals in the other group.
WSJ: Why Children Have More Control of Their Dreams
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