The choice theorist Edna Ullmann-Margalit posits that there are essentially three kinds of decisions: picking, choosing and opting. Picking decisions are the little ones we make every day: what to have for lunch; which toothpaste to buy. Choosing decisions are the middle-sized ones that involve the marshalling of reasons for and against: to buy this car or that. Opting decisions are the biggest; they mark a personal transformation because the person that comes out of them is different from the one that goes in. In the case of a country, they are moments where history itself pivots. Examples might be the decision whether to have children (for a person); whether to leave the UK (for the Scots); whether to exit the EU (for Britain).