It is an elegant yet provocative proposition: companies should prioritise the happiness of their employees. For many in business this will sound like the mystical mission of the government of Bhutan, or perhaps the philosophy of a New Age commune. It is in fact the belief enshrined in the principle underlying one of Britain’s best-loved companies: John Lewis. It is also the opening declaration of a new book from Mark Price, a former Waitrose managing director and deputy chairman of John Lewis, and now member of the House of Lords, and minister of state for trade and industry under Theresa May. Price’s argument in his new book, Fairnes