Many think of animal spirits in the context of optimism while other have sometimes thought of the animal spirits as irrational behavior. More recently, Robert Shiller has defined animal spirits in the context of "trust"
Keynes also argues that we know little about what will drive investments in the long-run. This is why there is a focus on animal spirits.
"If we speak frankly we have to admit that our basis for knowledge for estimating the yield ten years hence of a railway, a copper mine, a textile factory, the goodwill of patent medicine, an Atlantic liner, a building in the City of London amounts to very little and something nothing ...)"
Some of our decisions are not based on mathematical expectations. Hence, it is confidence that drives the decision to invest.
"Even apart from the instability due to speculation, there is the instability due to the characteristic of human nature that a large proportion of our positive activities depend on spontaneous optimism rather than mathematical expectations, whether moral or hedonistic or economic. Most, probably, of our decisions to do something positive, the full consequences of which will be drawn out over many days to come, can only be taken as the result of animal spirits - a spontaneous urge to action rather than inaction, and not as the outcome of a weighted average of quantitative benefits multiplied by quantitative probabilities."
"... human decisions affecting the future, whether personal or political or economic, cannot depend on strict mathematical expectation, since the basis for making such calculations does not exist ... it is our innate urge to activity that makes the wheel go around ..."
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