We document a sizable increase in the concentration of active users toward the top mobile apps. In narrowly defined categories, the share of active users for the top app increases from 38% in fall 2015 to 47% in spring 2022. This sharp rise in user concentration can be primarily attributed to...

Einführung in die Thematik -- Grundlagen des Mobile Commerce und die Rolle von mobilen Anwendungen im Kaufprozess -- Theoretische Grundlagen und empirische Untersuchung zur Bedürfnisweckung und Problemerkennung mit Mobile Commerce -- Theoretische Grundlagen und empirische Untersuchung zur...

This paper aims to provide a systemic vision of the role and specifics of a Covid-19 contact-tracing mobile application, which can be presented as a data-driven mobile application for citizens in urban data management processes and is essential for a sustainable urban ecosystem to inform the...