Why did Lisa's sales return increase?

Merchandising Business Lisa Marie is the owner of a merchandising business, Work It Out, which sells fitness and athletic equipment to gyms and personal trainers. Lisa's line has always been purchased from an upscale manufacturing business. In an effort to increase her profit margin, Lisa has changed to a lower-priced manufacturer. Prior to this change, sales returns had been 2%, which is an industry average. Recently, after reviewing her financial reports, her accountant tells her that her sales returns have doubled