The Art Market's Decision to Upgrade or Downgrade a Painting

The Che Guevara silk screen was created by Andy Warhol and his friend Melanga in the early 1960s. In 1963, when they meet, Warhol is looking for somebody to help him do these silk screens - pictures that aren't what we would traditionally call paintings or art. The pair create an astonishing number of screen prints in the first year: Liz Taylor's, a handful of Elvis's,. A lot of those car crash pictures. All of these are multiples. And within the screen prints, if you've ever seen a Warhol, quite a lot of repetitive images too. So they work really, really hard, churning out these things. They're getting more