Table 1: Estimated Rates of Agricultural Research
for the United States

Study	Time Period	Annual Rate of Return(%)
Griliches, 1964	1949-1959	35-45+
Lattimer, 1964	1949-1959	not significant
Evenson, 1968	1949-1959	47
Cline, 1975	1949-1958	39-47+
	1954-1968	32-39+
	1967-1972	28-35+
Peterson & Fitzharris, 1977	1957-1962	49+
	1967-1972	34+
Evenson, Waggoner, & Ruttan, 1979	1948-1971	45+
Davis, 1979	1949-1959
	1964-1974
White, Havlicek, & Otto, 1979	1942-1957	48
	1958-1977	42
Lyu, White, Liu, 1984	1949-1981	66
Braha & Tweeten, 1986	1959-1982	47
Huffman & Evenson, 1989	1950-1982	43
Norton & Ortiz, 1992	1987	30
+ Return to research and extension combined.