 
Summary: OPERATIONS RESEARCH
doi 10.1287/opre.1080.0562ec
pp. ec1ec6
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Electronic Companion"Joint Inventory and Pricing Decisions for an
Assortment" by Goker Aydin and Evan L. Porteus, Operations Research,
doi 10.1287/opre.1080.0562.
Online Supplement for
"Joint Inventory and Pricing Decisions for an Assortment"
Goker Aydin and Evan L. Porteus
Appendix A
Proof of Lemma 1: Using (A2), we rewrite (3) as (ti(p, y
i (p))) = pici
pi
. Implicit differentiation
of this identity with respect to pi yields
[ iti(p, y
