Once you’ve worked a four-hour shift, every price tag quietly turns into hours of your life.

Money stops being abstract once you have earned some of it slowly. A pair of trainers becomes a number of shifts, a night out becomes a Saturday morning you stood up for, and the conversion happens automatically whether you want it or not. That is not meanness arriving; it is a more accurate sense of what things cost.

Work out your actual hourly rate after tax and keep it in your head. Before anything over a certain size, convert the price into hours and see whether it still looks worth it. Some things will, which is useful to know too.