Don's Decoys manufactures fine hand-carved duck decoys for hunters around the world. The work is very precise and requires the experienced hand of Don and a selection of specialized carving tools (knives, chisels, and so on). Don's production technology is Cobb-Douglas, and he has estimated his production function to be f(D,T)=145.55D0.37T0.78 , where D is Don's effort and T is the number of tools that he uses