Informational efficiency of the US SO2 permit market

  • 1 January 2004
    • preprint
    • Published in RePEc
Abstract
We test the information efficiency of the market for SO2 permits in the US. In order to do so, we perform a number of unit root tests and test if the changes in the SO2 permit price are serially correlated. Furthermore, we test if it would have been possible to earn a profit based on knowledge on the SO2 permit’s price history. The evidence presented in this paper suggests that this market is efficient from an informational point of view. Although one could question this hypothesis from a statistical point of view, economic significance suggests that this market is indeed efficient.
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