You cannot measure some of the most important things in life. How much utility does a wheel of cheese have? How badly can a heart be broken? What is the price of a happy marriage? Not all of human behaviour can be reduced to a number or a price. And there are some general axioms worth remembering that seem to always be true in all places at all times. You cannot get rich by spending more than saving. Nations don’t become powerful consuming more than they produce. Debt is not wealth. War is not peace. Freedom is not slavery. And ignorance is not strength.