The artist I mentioned in class is J.S.G. Boggs. He draws, or finishes drawing, his currency in public places, waits for a crowd to gather and someone to say something along the lines of 'gee, that's quite a drawing you have there' before asking if they will accept it for the equal amount of goods. His work is one-sided and usually only of low denominations - the stated idea of the performance being to see whether or not someone will accept art instead of money.
At p.4 Baudrillard writes that unmasking the simulacrum 'God' reveals that 'deep down God never existed, that only the simulation ever existed, even that God himself was never anything but his own simulacrum,' which would certainly seem to imply that simulacra were always simulacra, never 'images,' i.e. that they never concealed anything substantive.