What are we actually measuring though? Wealth is always relative, so we are trying to measure positions between different groups towards each other. If you give

What are we actually measuring though? Wealth is always relative, so we are trying to measure positions between different groups towards each other. If you give each of your kids 5$ and charge them 5 bucks for a pie and then one of them gets a raise of 10$ and the price of the pie raises to 7$ then the wealth of the other child effectively shrank. "Things should be made as simple as possible, but not simpler".