为什么套现可以防止纽约和苏黎世的金价相差过大

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在罗伯特的微观经济学上看到一句话，the possibility of arbitrage prevents the prices of gold in New York and Zurich from differing significantly and creates a Wolff market for gold.   我想问为什么 套现可以防止纽约和苏黎世的金价相差过大   实在不懂这个逻辑关系 求大神打救！！

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关键词：苏黎世 significant Possibility Arbitrage Prevent creates 经济学 罗伯特 market 苏黎世

If the prices of gold in New York and Zurich differing significantly, the gap keeps hanging there and you happened to find out, you may,
borrow cash at low price exchange location, long gold and go to
high price exchange location, short gold get cash, turn around and
pay your debt, enjoy the profit.
If you are fast enough, you may keep doing this until richer than Bill Gates.
I hope this helps.