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→What is the author's topic and hypothesis?
The effect on Investment from a change in cost of protection equals the change in Investment from a change in protection multiplied by the change in protection from a change in cost of protection.
Since <math>\frac{\partial P}{\partial C_{p}} < 0</math> we know that an estimate of <math>\frac{\partial I}{\partial C_{p}}</math> is informative about the sign of <math>\frac{\partial PI}{\partial C_{p}P}</math>
=== How does the author test the hypothesis? ===