Always one for quirky trivia, Essential Pittsburgh business contributor Rebecca Harris fills us in on the origins of the now ubiquitous coupon. Perhaps more intriguing, however, is the coupon’s future. Though 80-90% of the coupon market still lies in print, the online coupon market is exploding. This is especially true when it comes to smartphones, with the mobile market projected to be $46 billion by 2016. Harris says, the advent of personalized coupons means mass coupon printing is no longer necessary. “You don’t have to be a huge retailer,” she says, to enjoy the benefits of the mobile coupon craze.