向后移动到下一个链接或URL，如果需要将会循环。这个函数不完全精确，但非常接近。

Move backward to the next Wiki link or URL, cycling if necessary. This function is not entirely accurate, but it's close enough.

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根据委托—代理理论，由于委托人与代理人目标函数不完全一致以及信息不对称，会产生代理问题。

According to the principal-agent theory, the different target functions and unsymmetrical information of the principals and agents will give rise to the problem of agent.

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电力市场是一个不完全竞争的市场，模拟这类市场成员策略使用较多的模型有古诺模型、供应函数均衡模型等。

The real electricity market is an imperfect competition market. And to simulate the strategies of suppliers, some models such as Cournot and supply function equilibrium are employed.

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