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Reciprocity: DuoLingo

Freemium Model: By giving away a fully functional, free product (and later asking customers to upgrade to get rid of ads), Duolingo creates a need for reciprocity, which grows the longer people use the app. 

Duolingo Reciprocity

More examples of Reciprocity

Reciprocity: DuoLingo
Reciprocity: GoToMeeting
Reciprocity: McDonald’s
Reciprocity: Creative Market
Reciprocity: Peloton
Reciprocity: Starbucks Loyalty
Reciprocity: Magnolia