Abstract
The paper focuses rigid prices and market power relations, enhancing conceptual and measuring problems of that last phenomenon. Characteristics and properties of the kinked demand curve and other post Keynesian models —supporting price rigidity— are contrasted with relevant microeconomic neoclassical proposals about the short and long run market adjustments. Also are analyzed competition policy implications of price rigidity and the potential of the Price Alignment Quotient as an instrument for price rigidity detection.
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