There have been quite a few blog posts lately discussing how one would explain to a "non-math" person why a negative times a negative is a positive. I think the reason we have such a hard time explaining it is because it's not true. We need look no further than California's own Nancy Pelosi for the explanation. (Check right around 3:50)
In an interview with CNBC's Maria Bartiromo, Pelosi was asked if the expiration of the Bush tax cuts would amount to a tax increase.
"It's not a tax increase. It is eliminating a tax decrease that was there."
So there you have it--eliminating a decrease does not amount to an increase. I had better go fix those lesson plans. Thanks for clearing things up, Ms. Pelosi.