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How is absolute risk aversion function defined

How is absolute risk aversion function defined?

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The last point, in the above leads to definitions for measurement of risk aversion. The absolute risk aversion function is defined as

A(W) = - (U’’(W))/(U’(W))

The relative risk aversion function is defined as

R (W) =- (WU’’ (W))/ (U’ (W)) = WA (W)

Utility functions are frequently used to analyse random events.

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