A buyer needs a hundred eyes, the seller but one.

买者要具百只眼，卖者一只已有余。

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But there was one interesting anecdote that I found in Indonesia. In all schools in Indonesia, there is usually a toy seller in the playground.

在这里是个大问题，我在印尼倒是遇到一个有趣的故事，在印尼所有的学校里在操场上通常有一个卖玩具的人。

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When a company has exclusive control over the market for a product. or when there are many buyers but only one seller.

某一公司的某产品完全控制了市场。或有许多买家，但是只有一家卖家。

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Deals with sovereign governments face fewer obstacles because seller and regulator are one and the same, but sticking points remain.

ECONOMIST: What China wants and can offer for its money

"Main Street vendors have to collect for just one jurisdiction, but now they want to knock the remote seller over to the other side, which is to know the rates and compliance requirements of 30, 000 jurisdictions, " Nebergall said.

CNN: The Internet tax revolt