=+b. The only way you are willing to ship apples to a far-away market is if you can get as much for those apples as you can get in your town, which means you will add the per-pound transportation cost c to the price you charge for your apples. How will the slope of the budget constraint for the far-away consumer differ from that for your local consumer, and what does that imply for the opportunity cost of good apples in terms of bad apples?