We've all employed rationalizations for our purchases, whether it's crunching the numbers on the cost per wear or persuading ourselves that snagging a discounted item equates to savvy savings. This isn't exactly a new way of thinking while social media has recently labeled it as "Girl Math". Dr. Grace Lee, professor of economics at Monash University Malaysia speaks to us on the psychology behind girl math and when it becomes too dangerous.Image credit: Shutterstock.com