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Mariana Lopes Barata and Pedro Simões Coelho collected data from 324 music-streaming service users to identify factors that influence users to opt for paid (premium) versions of music streaming services, like Apple Music. They hypothesized that performance expectancy (how much the use of a service is perceived to benefit the consumer) would be positively correlated with users' intentions to adopt premium versions. The researchers asked participants to rate statements such as "Using paid music streaming services increases my productivity." They found that, indeed, performance expectancy positively influences the intention to adopt premium streaming service versions, which suggests that ________