This dissertation is intended to widen our understanding of three issues among IT-mediated phenomena observed after the revolution of social structure accompanied by the "paradigm shift": (1) learning behavior of IT knowledge workers, (2) users’ consumption behavior of wireless communication services, and (3) consumer’s online shopping behavior, from the standpoint of research domain. For the perspective of research methodology, all four essays constituting the dissertation are developed based on an economic and econometric analysis. While the essays seem to be loosely tied together in either research methodology or research domains, they all aim to better understand the human intentional or adapted behaviors in everyday IT-driven socio-economic environment.
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