“…The intercept A in equation 3is estimated by simple regression (assuming a multiplicative error) to be 13.9885 for the 1965-1969 data. [14,20]; Fertilizer and lime, tons purchased [16]; Feed, seed, and livestock, purchases from non-farm sector adjusted for interfarm sales [17]; Machinery, annual investment (interest and depreciation) [18]; Labor, man hours used for farm work [16]; Real estate, annual investment in land adjusted for farm programs capitalized into land values [18]; Machinery and operating expenses, fuel, repairs and operations [17]; Miscellaneous current operating expenses, less pesticide expenditures [13,15]; Crop and livestock Inventory, interest on inventory [18].…”