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Some kinds of arbitrage are completely risk-free—this is pure arbitrage. For instance, if euros are available more cheaply in dollars in London than in New York, arbitrageurs (also known as arbs) can make a risk-free profit by buying euros in London and selling an identical amount of them in New York. Opportunities for pure arbitrage have become rare in recent years, partly because of the globalization of financial markets. Today, a lot of so called arbitrage, much of it done by hedge funds, involves assets that have some similarities but are not identical. This is not pure arbitrage and can be far from risk free.