Best Buy said some of Wal-Mart’s promotions, including a deal on the iPhone 5, had a measurable effect on its profits due to a price-match guarantee that requires the retailer to match the price of competitor’s ads. Best Buy said it lost about $65,000 in profit the day Wal-Mart’s promotion first ran on Facebook, because it was compelled to match Wal-Mart’s advertised $150 price, even though it concluded that Wal-Mart didn’t actually have a sufficient number of iPhones available.

Here is a cached version of the article.