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The advent of online streaming has led many music listeners to drift away from ownership of music (through downloads or through physical media such as compact discs) in favor of the streaming services YouTube Music and AccuRadio, among others. Luis Aguiar studied the effect of the 2011 implementation of a restriction on the free version of the French streaming service Deezer: its unlimited usage was reduced to five hours a month, while the paid premium version's usage remained unlimited. Aguiar found that listeners who used the free service visited licensed online music sellers (e.g., the iTunes store) and sites that make unlicensed music available to download about 2% less after the restriction was implemented, suggesting that _____