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5Published 1994Subjects: “…economic implication…”
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8Subjects: “…economic implication…”
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13by National Bureau of Economic Research, Cambridge, Popp, David, Newell, Richard, Jaffe, Adam B.Subjects: “…economic implication…”
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14Published 2000Subjects: “…economic implication…”
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20Published 1996Subjects: “…economic implication…”
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