We characterize arbitrage-free interval.

我们刻画了无套利区间。

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Preventing the free flow of goods and services and capital across international boundaries. That is a danger because in order for markets to work, you need arbitrage to work.

阻止商品、服务以及资本的跨界自由流动是十分危险的，因为想要使市场发挥作用，你就必须令套利发挥作用。

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If you discover an arbitrage opportunity-otherwise known as a "price anomaly" or "free money" -it will be profitable only as long as few people know about it.

如果你发现了一个套利机会，那么只有其他人还不太知道它时，它才会让你盈利。

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However, one of this summer's best investment tips, currency arbitrage, is risk-free.

ECONOMIST: Midsummer madness

This risk-free arbitrage trade locked in a small profit for the institutional investor and kept the SuperUnit market price in line with its underlying value.

FORBES: ETFs Turn 20-Years Old in the U.S.

But unlike closed-end funds, if SuperUnits developed a discount to its underlying securities value, then institutional investors could arbitrage the units and profit risk-free.

FORBES: ETFs Turn 20-Years Old in the U.S.