
The Japanese edition, built entirely on Japanese examples. Change the order of the questions and the survey answers change; one sentence from the Governor of the Bank of Japan moves the market in minutes; put two good reasons side by side and the sign-up rate falls. Four tools — superposition, measurement, interference and entanglement — make everyday puzzles legible, and two chapters belong to this edition alone: the Bank of Japan’s policy meeting read as a measurement taken on the market, and the consumption tax that charges 8% to eat in and 10% to take away the same rice ball. Twelve chapters in all, with convenience stores, gacha probability disclosures, Mercari pricing, NISA and the economics of fandom. Each chapter carries review questions, with model answers at the back, and the mathematics starts from high school and moves one step at a time.