Period | Scale effects | Elasticity of cost w.r.t. output | The dual measure of TFPG | Returns to scale | Economies of scale |
1961-70 | 0.041 | 0.230 | −0.021 | 4.356 | 0.770 |
1971-80 | 0.051 | 0.231 | −0.023 | 4.324 | 0.769 |
1981-90 | 0.022 | 0.245 | −0.023 | 4.087 | 0.755 |
1991-00 | 0.024 | 0.292 | −0.024 | 3.422 | 0.708 |
1961-00 | 0.034 | 0.249 | −0.023 | 4.017 | 0.751 |