I recently heard a statistic that people with a debit or credit card spend on average 15% more than those who pay in cash. Does anybody attest to this being true? I don't have one, so I can't really go either way.
Probably true. I did spend less when I had no credit card and debit card. But I also had less money too.
Also Credit cards are good if you pay them off after getting the bill so their is no interest.
You are using someone else's money and they dont collect till the end of the month. As long as you pay back the person the same amount of money no interest in accrued. And since the value of a dollar today is more valuable than the dollar of tomorrow (Present Value of money principle) theoretically what you pay them back is less than what you borrowed.
Credit Cards can be your best friend if used correctly. Which most people do not.