Non Linear Contracting and Endogenous Buyer Power between Manufacturers and Retailers: Empirical Evidence on Food Retailing in France



The theoretical cross-price elasticity of demand of product j with respect to price of product к is


then


Дуй


_ ∂sj pk _ Pk 1 ]_ ∙^-'∙ ∂Pjj

∂pk Sj    Sj N 2-^i=ι ∂pk J

_ pk (N ∑i=ι (/ aibijt(ai)Likt(ai)f (ai)⅛))


which can be simulated using


sEjk _ pk N ∑*=ι (⅛ ∑<∙=ι a^(аг)цы(аг))


Similarly, the theoretical own price elasticity is


E∙ ∙

Ejj


dsj
∂p
j sj


pj A 1 ∖^'' dPij ʌ
Sj N z-^≈= ∂pj )


s. Nn ^ ʌ; 1 ʃ aiLijt{ai) (1   Lijt{ai)') f (щ^а^^


which is simulated using


sEjj _ -pΓ [N Γ 1 (⅛ Σ^ 1 arLijt(ar) (1 - Ll3t(a)))
Sj   IN      ^— 1∖^-ZL     1                                   J


41




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