This report analyzes the law of demand and supply, their movements and variations, and evaluates the theories of 20th and 21st century related to modern business practices. It focuses on FamilyMart Company, Ltd, a Japanese convenience store, and covers the concepts of neoclassical theory, Keynesian economics theory, behavioural theory, and nudge theory. Course code: BM533, Course name: Contemporary Economic Analysis, College/University: Not mentioned.