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The "environmental Kuznets curve" (EKC) hypothesis posits that at early stages of development, pollution per capita and GDP per capita move in the same direction. Beyond a certain income level, emissions per capita decrease as GDP per capita increases, thus generating a U-shaped relationship between GDP per capita and pollution. One study concluded that the econometrics literature did not support either an optimistic or a pessimistic interpretation of the hypothesis. Instead, it suggested some degree of flexibility between economic growth and emissions growth.[citation needed]