While investors have been busy plowing money into high-growth tech and AI stocks, another asset has been quietly outperforming the S&P 500 for years. Most people probably don't think of luxury goods as a "market" per se, but experts argue that many high-end items are investments just like stocks or gold, and recent data shows that several bags and one ultra-rare type of sneaker have blown the S&P 500 out of the water. The handbag at the top of the list isn't even a Birkin, though it is made by