Sometimes consumers may be unable to react to a price increase, nevertheless, producers may be able to do so by for example, increasing their supply to satisfy the demand of these consumers. If other producers respond to an increase in the relative price of the products supplied by the single supplier by switching production facilities to producing the monopolized collection of products, the increased level of supply may render any attempted price increase unprofitable. In this case, those producers with the ability for supply-side substitution should be included in the relevant market.
