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The Phillips curve has flattened in Spain over 1995-2006: unemployment has fallen by 15 percentage points, with roughly constant inflation. This change has been more pronounced than elsewhere. The authors argue that this stems from the immigration boom in Spain over this period. They show that the New Keynesian Phillips curve is shifted by immigration if natives' and immigrants' labor supply or bargaining power differ. Estimation of the curve for Spain indicates that the fall in unemployment since 1995 would have led to an annual increase in inflation of 2.5 percentage points if it had not been largely offset by immigration.
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