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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NOTICE: this is the author’s version of a work that was accepted for publication in Economics Letters. Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be reflected in this document. Changes may have been made to this work since it was submitted for publication. A definitive version was subsequently published in Economics Letters, volume 99, issue 2 (2008). DOI: 10.1016/j.econlet.2007.07.008
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