Quantum economics and finance uses quantum mathematics to model phenomena including cognition; financial transactions; and the dynamics of money and credit. This talk takes a particular route into the subject; through a discussion of the quantum coin. Unlike a classical coin toss; which can be either heads or tails; a quantum coin can be – like Schrödinger’s cat – in a superposition of states. This gives it intriguing properties which can be used to simulate everything from the prisoner’s dilemma; to the credit relationship; to the pricing of options. The talk is based on material the book Quantum Economics and Finance: An Applied Mathematics Introduction.