This paper investigates the validity of the law of one price (LOP) in international financial markets by examining the frequency, size and duration of inter-market price di erentials for borrowing and lending services (`one-way arbitrage'). Using a unique data set for three major capital and foreign exchange markets that covers a period of more than seven months at tick frequency, we nd that the LOP holds on average, but numerous economically signi cant violations of the LOP arise. The duration of these violations is high enough to make it worth- while searching for one-way arbitrage opportunities in order to minimize borrowing costs and/or maximize earnings on given funds. We also document that such opportunities decline with the pace of the market and increase with market volatility.
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Paper provided by Norges Bank in its series Working Paper with number
2008/19.