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CompetitionPolicyinTwo-SidedMarkets
-SomebriefremarksDrAmeliaFletcherChiefEconomistOfficeofFairTradingLEARConference
7thJune2007NBTheviewsexpressedherearemyown,andnotnecessarilythoseoftheOFT
Whatdocertainkeyfactorsof2-sidedmarketsmeanfor:Marketdefinition?Predation?Collusion?Exclusivecontracts?Mediaregulationandmergers?
2-sidedmarkets:FirstkeyfactorInatypical2-sidedmarket:DAisfunctionnotonlyofpAbutalsoofqBDBisfunctionnotonlyofpBbutalsoofqAWhatdoesthismeanformarketdefinition?
MarketdefinitionSSNIPtest:Couldahypotheticalmonopolistprofitablysustainasmallbutsignificantandnon-transitoryincreaseinprice?Ifno,therelevantantitrustmarketmustbewiderIfyes,themarketisnotanywider(butcouldbenarrower)Keyquestionfor2-sidedmarkets:Whichfeedbackloopsshouldbetakenintoaccount?
Marketdefinition:FeedbackloopspA↑qA↓πA↑πA↓πA↑NormalMarket:DoestotalπA↑?Ifyes,marketnowider?
Marketdefinition:FeedbackloopspA↑qA↓DB↓qB↓πA↑πA↓πB↓ForgivenpBπA↑NormalMarket:DoestotalπA↑?Ifyes,marketnowiderFeedbacktomarketB
Marketdefinition:FeedbackloopspA↑qA↓DB↓qB↓πA↑πA↓πB↓ForgivenpBπA↑NormalMarket:DoestotalπA↑?Ifyes,marketnowiderFeedbacktomarketBShouldwe
takethisintoaccount?
Marketdefinition:FeedbackloopspA↑qA↓DB↓qB↓DA↓qA↓πA↑πA↓πB↓πA↓ForgivenpBForgivenpAπA↑NormalMarket:DoestotalπA↑?Ifyes,marketnowiderFeedbacktomarketAFeedbacktomarketB
Marketdefinition:FeedbackloopspA↑qA↓DB↓qB↓DA↓qA↓πA↑πA↓πB↓πA↓ForgivenpBForgivenpAπA↑NormalMarket:DoestotalπA↑?Ifyes,marketnowiderFeedbacktomarketAFeedbacktomarketBShouldwe
takethisintoaccount?
Marketdefinition:FeedbackloopspA↑qA↓DB↓qB↓DA↓qA↓πA↑πA↓πB↓πA↓ForgivenpBForgivenpAπA↑NormalMarket:DoestotalπA↑?Ifyes,marketnowiderpB↓qB↑πB↓ProfitsdissipatedinmarketBFeedbacktomarketAFeedbacktomarketBShouldwe
takethisintoaccount?
Marketdefinition:FeedbackloopspA
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