Appendix B
With price-advertising interaction terms included in equations (2) - (6), the
corresponding own demand elasticities (in absolute values) are
ηiLM (=- (cii +γiAi)( pi Iqi) ), ηiSL(=-(cii+γilnAi)Iqi), ηiDL
(=-(cii+γilnAi)), ηiRM (=-(cii+γidlnAi)Iwi), and ηiAIDS
(=- ((cii +γi ln Ai)Iwi - 1)), respectively. The ∂lnηI∂lnA term in table 1 is
derived as follows:
(B1)
∂ lnηiLM
∂ ln Ai
∂ηLM
iLM
ηiLM∂lnAi
pi
LM
ηiLM
piqi
- (cii + γiAi)pi
-cii∂qi
qi2∂lnAi
- cii ∂ ln qi +
qi ∂ ln Ai
γi(qi∂Ai /∂lnAi - Ai∂qi /∂lnAi)
qi2
YiAiqi (dln Ai IdlnA1-dln qi IdlnAi)
qi2
= YiAi - (cii + YiAi )αii
cii + YiA
(B2)
∂ lnηiSL ∂ ln[-(cii +γi ln Ai)] ∂lnqi
∂ln Ai
∂ln Ai
∂ ln Ai
∂[-(cii +γilnAi)]
(cii +γilnA)∂lnAi
-αii
(B3)
∂ lnηiDL
∂ ln Ai
(B4)
∂ lnηiRM
∂ ln Ai
γi
cii +γilnAi
∂ηiDL
ηiDL ∂ ln Ai
=(
∂ηiRM
ηiRM∂lnAi
-1
RM
ηiRM
-αii,
-1
cii +γi lnAi
-1
RM
ηiRM
∂(-cii) γi∂lnAi
∂ ln Ai ∂ ln Ai
cii∂wi
wi2 ∂ ln Ai
Yi and
cii +YilnAi
γi(wi -dlnAi∂wiI∂lnAi)
wi2
-ciidlnwi + Yi(1-dlnAdlnwi IdlnA-)
wi ∂ ln Ai
wi
34
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