Here is what it is. About a year ago, I got a 'special deal' on a credit card, interest free for one year on purchases and balance transfers. I took advantage of it.
The year is up, and now a 13% interest rate kicks in. So by paying off the credit card, I am saving about $120 a month for approximately five years, in essence generating a 13% return (as the alternative is not paying it off and paying the high interest). And of course, there is no taxation on the $120 per month savings. Such a deal.
This is obviously a very simple 'investment' or money management technique. Just wanted to reinforce the benefits of credit card payoffs, especially to those who are getting credit cards for the first time.