no it won't but it doesn't need to. I worked in a retail grocery store and was amazed at how low the margins were, shrjnkage and theft can really kill a business because of those small margins. I realised that I would never open such a business that depends on razor thin margins, but to your question, there are items that you will break even on or lose money such as bread, because you know that consumers will buy more goods. Its the same for Amazon, they need to get the purchase first. Diapers.com actually loose in their diapers but make their money on all the other products.