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hellestal's journal
I disagree with you, Keen metaphor perfectly fit DSGE models. To begin with, Ptolemy model is about the positon of the planets, and no, u coudn't use it to predict the position of Jupiter in 2012. The predictive capacity of ptolemy model depends on the assumption that planet orbits are repetitive patterns, since its not the case, the model loose accuracy as time goes on. The bottom line is that Ptolemy model doesn't explain the movement of the planets, it only "ape" real world observation without understanding it, and the only reason why it where predictive in the past is because planets orbits are almost repetive patterns. DSGE models are just irrelevant to describe real world economy because economy is never repetitive, so DSGE can only "ape" real world data from the past and doesn't tell you anything relevant about the future...None of this is remotely relevant.