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JEL classification: D41 F15 F3 G1Keywords: Law of one price Arbitrage a b s t r a c t Several articles find no support for the LOP in commodity markets. A few articles find some support. Rejecting the LOP would strike at the heart of economic theory. Rejection would suggest that firms do not maximize wealth and households do not maximize utility. Our objective is to show how four common pitfalls can cause tests of the LOP to fail when in fact the LOP holds. All tests that fail to support the LOP fall in to at least two pitfalls. All of these pitfalls are the result of ignoring important practical implications of arbitrage.

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