True.......but then I see hoards of people in GO stores happily paying the inflated prices without a second thought. It seems likely that they will make more than enough from these sales to outweigh the few people that make the most of their price match. Lets face it - even with a good price match deal they are very likely to still be making a small profit.
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Ah, but the point here is that it's a small profit for a small retailer. Let's say £10 or so after all costs are deducted is great for a small retailer but for a big retailer it's likely that the small profit you speak of will be eaten up in logistical costs and that's where you have a long term problem.
Most large retailers base prices on bottom line margins and if you go under these too much (ie. with below cost price matches) you risk the integrity of the business as a whole by bringing down the average margin over the course of a year.
I think retail has got to the stage where consumers still think big businesses are working on the 1:1:1 strategy (1 for stock, 1 for overheads, 1 for profit). These days are long gone I'm afraid and most of the bargains people get at end of season sale prices for example, are retailers cutting their losses to get 75p in the £ or similar on purchased stock to avoid sitting on stock all winter.
Bear in mind that stock on the shelf loses value at 6% annually simply down to the money tied up in it that could be better used elsewhere