We present a new proof of the interiority of the policy function based on the Inada conditions. It is based on supporting properties of concave functions.
Aliprantis, C.D., G. Camera and F. Ruscitti (2008). Interior optima and the Inada conditions. Economics Letters 99(2), 293-297. doi: 10.1016/j.econlet.2007.07.008
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