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.
由于资本成本高低不同，权益筹资和债务筹资必须符合不同的边际资本产出水平条件。
Because of different costs of capital, equity financing and debt financing must satisfy their own required levels of marginal capital output.
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