| 单词 | second order of magnitude |
| 释义 | second order of magnitude Effects which are so small that they can be neglected for practical purposes. Economic models frequently approximate actual functions by local linear approximation. If y = f(x), and y(a) is known, then if b is small, y(a + b) can be approximated by y(a + b) ≈ y(a) + bdy(a)/da. This approximation rests on the assumption that any further terms in the exact expression for y(a + b) are of second order of magnitude. |
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