电报线路提供了类似的经济挑战——很高的启动资本和很低的边际运营成本。

Telegraph lines presented a similar economic challenge-high start-up capital and low marginal operating costs.

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人力资本对经济增长的促进作用归因于其边际收益递增的正外部性。

The Function of Human capital to economic growth is attributed to its marginal income increasing by degrees.

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如果经济是收敛的，在收敛的过程中，落后经济由于具有较高的资本边际产出从而增长速度将比发达经济的增长速度快。

If the economic is convergent, in this process, the backward economy will have higher growth rate than that of the development economy because of the higher marginal output of capital.

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