Long-run data for western nations do seem to support this proposition . 西方国家的长期历史资料似乎的确支持了这种论点。
2.
Although predictions as to long-run costs were impossible, two facts became apparent almost at once . 虽然预计长远耗费不可能，但是有两件事几乎立即就显而易见。
3.
In pure competition, as expounded by the late-nineteenth-century economist marshall, entry and exit determine the long-run equilibrium of an industry . 在纯粹竞争条件下，正象十九世纪后期的经济学家马歇尔揭示的那样，加入和离开决定某一工业部门的长期平衡。
