What is the opportunity cost of your decision

Question

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.

Answer 1

Driving to the other store to save $50 does involve some cost in terms of time and inconvenience.  However, for most of us the time it takes to drive two miles would be worth $50.  For example, if it takes about ten minutes extra time and a negligible amount of gasoline (unless your time is worth $300 an hour, or $50 per each ten-minute period), it would benefit you to drive to the other store.  While in the second case, $50 may seem like less compared to the $6000 total price, for you the $50 is still a $50 savings, exactly the same as in the first case.  Therefore, you should apply the same reasoning.  Is the $50 benefit from driving the extra two miles worth the cost?  The conclusion should be the same in both cases.