I am trying to estimate a demand function:
Y=K * X1^b1 * X2^b2 * X3 ^(-1-b1)

in log form:
ln Y = ln K + b1 ln X1 + b2 ln X2 + (-1-b1) ln X3

As the regression coefficients are related for 2 of the regressors, I am not
sure of the appropriate methodology or function in R to handle this. Any
hints?

thx,
Tarun

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