In his essay on imitation in the arts, Adam Smith considers that the exact copy of an artwork always deserves less merit than the original. But the hierarchy between copies and originals has changed over time. So has the perception of copies by lawyers, philosophers, art historians and curators....

While there are no significant investment characteristics that inhibit art from being considered as an asset, a major hurdle has long been the lack of a systematic measure of its financial performance. Due to its heterogeneity (each piece is different) and its infrequency of trading (the exact...