Are you aware of any listed funds (domestic or international) that invest in art and are accessible to retail investors? There are a couple of hedge funds that do this. Another way to play this is through auction houses but Christies is private. While Sotheby's is public, some part of its revenue/profit stream is tied to financing. Thus, if the stock markets collapse and Sotheby's customers who have received financing on the basis of wealth tied to stocks start defaulting on loans, Sotheby's takes a big hit. Hence the poor performance of Sotheby's (BID) in 2008/2009.
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Sort of in the general vicinity, here's a large pawn store chain in the UK: http://www.albemarlebondplc.com/Our-Business/Strategy