Investopedia explains 'Parity Product'
A business selling a parity product will in most cases be unable to command premium pricing because of the substitution effect. If the business raises its price while competitors do not raise theirs, consumers will buy less of its product and instead purchase competing products. In this sense, the cross elasticity of demand for the competing goods will be positive, since an increase in price of one brand's good will result in an increase in demand for another brand's good.
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