If you're a cash-only business, chances are you hear the question "do you accept cards?" multiple times a week. Whatever your reasons are for not getting in the game - processing fees, the hassle, aversion to change - you might want to start reconsidering your position.

Cash isn't necessarily going anywhere, but we're using it less and less. Some data here: A recent Nilson Report projects that cash and check payment volume will decline by 24 percent and 46 percent (respectively) in the United States by 2018. At the same time, card payment volume is set to grow by over 50 percent in the same period. So it's worth making sure your business is set up to accept all forms of payment. You want to be able to make every sale.

The good news is that it's now really easy to accept credit cards - whether you're a roadside fruit vendor or a multilocation coffee shop.