In our house we one Credit Card to buy almost everything from stores, the reason is the "Rewards" program. Almost one percent of our purchases is rewarded back in points, I convert these points into Registered Retirement Savings Program products at our Bank, then claim the deduction on my income tax (kind of a win/win I think).

I should also add that we do not carry a balance on the cards so there is no interest charges.

But it does need electricity and the Credit Card system to be running to function, so I carry cash also.

Mike