If you’re thinking of gifting an Hermès Birkin bag to the fashionista in your list, you might have to wait months to get hold of one. In fact, you might have to plan for the Birkin to be next year’s gift while you order one now. The reason, the US economic growth has witnessed a surge in demand for Birkin bags, but supply is scarcer than ever before according to the latest market research conducted by ultra-luxury consignment service, Baghunter. Factors such as a growing US economy and celebrities continually pictured with Birkin bags have both contributed to an increase