Pippen states, "Memorabilia is an all time high right now," and notes that high-end auction houses like Sotheby's (normally known for fine art) are now aggressively targeting sports gear. Sotheby's is a private company. eBay is the primary publicly traded marketplace for sports trading cards, collectibles, and memorabilia. If the asset class is experiencing a secular boom and high valuations, eBay's Gross Merchandise Volume (GMV) in the collectibles category should benefit from increased transaction velocity and pricing. LONG eBay as a proxy for the booming collectibles market. The collectibles market can be a bubble; if the economy slows, discretionary spending on memorabilia often dries up quickly.