For the population of firms in the chemical industry, let rd denote annual expenditures on research and development, and let sal
es denote annual sales (both are in millions of dollars).
a. Write down a model (not an estimated equation) that implies a constant elasticity between rd and sales. Which parameter is the elasticity?
b. Write out the estimated equation in the usual form. What is the estimated elasticity of rd with respect to sales? Explain in words what this elasticity means.
a. Write down a model (not an estimated equation) that implies a constant elasticity between rd and sales. Which parameter is the elasticity?
b. Write out the estimated equation in the usual form. What is the estimated elasticity of rd with respect to sales? Explain in words what this elasticity means.
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