Assume an oligopolist confronts two possible demand curves for its own output, as illustrated below. The first (A) prevails if other oligopolists don't match price changes. The second (8) prevails if rivals do match price changes.

(a) By how much does quantity demanded increase if price is reduced from $11to$9 and
(i) Rivals match price cut?
(ii) Rivals don't match price cut?
(b) By how much does quantity demanded change when price is raised from $11 to $13 and
(i) Rivals match price hike?
(ii) Rivals don't match price hike?

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$19 17 Demand A Demand B 15 13 11 5 3 0 2 4 6 8 10 12 14 16 18 20 QUANTITY (units per period) PRICE (dalars per unit)