Mobile app portfolio management and developers’ performance: An empirical study of the apple app store

Differences in competitors’ market influence due to market structure: Evidence from Japanese gambling market

“…From the perspective of the companies affected in the market, the impact of firms with large competitive sales are shown to vary from situation to situation. Li et al studied the relationship between product portfolio diversity and popularity for all businesses in the mobile app industry, which has many small businesses [ 27 ]. In this study, the popularity of existing applications in the same category was shown to have a positive impact on new applications.…”