People are wired to think of a wealth as a zero sum game. If tomorrow everybody's income will increase by 10%, people will pay much less attention at their inco

People are wired to think of a wealth as a zero sum game. If tomorrow everybody's income will increase by 10%, people will pay much less attention at their income getting bigger, but the fact that this increase is smaller in absolute value that someone's else. Which would naturally feel to them as if they were robbed of this extra somehow.