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I am using the code below.  Is this the correct way to instrument?

local varcost lnq lnpk lnpl lnpf lnpm lnqq lnpkpk lnplp lnpfpf lnpmpm ///
    		lnpkpl lnpkpf lnpkpm lnplpf lnplpm lnpfpm lnpkq lnplq lnpfq lnpmq

local share lnq lnpk lnpl lnpf lnpm

reg3 (lnc = `varcost' one)   (sk sl sf = `share' one), endog(lnq)
exog(lnoutput) ireg3 noc nolog cons(1-22)

Thanks in advance for your help,

Leslie
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