Suppose you arrive at a store expecting to pay $100 for an item, but learn that a store two miles away is charging $50 for it.  Would you drive there and buy it?  How does your decision benefit you?  What is the opportunity cost of your decision?  Now suppose you arrive at a store expecting to pay $6000 for an item, but learn that it costs $5950 at the other store.  Do you make the same decision as before? Perhaps surprisingly, you should!  Explain why.