This course analyses the economics behind the digital economy. The course examines a variety of topics, including (1) pricing and demand for digital goods; (2) two-sided markets and platform competition; (3) network effects and standard; (4) online reputation mechanisms; (5) digital payment systems and virtual currencies; (6) digitisation and innovation; and (7) economics of artificial intelligence. Economic theories, especially those from information economics, would be used to analyse and explain phenomena observed in the digital economy.