Money is a very interesting reward to study though because of its paramount importance in society. With money, one can do and focus on a lot of things. Without

Money is a very interesting reward to study though because of its paramount importance in society. With money, one can do and focus on a lot of things. Without money, life is hard. Even in countries with a welfare state, as most benefits are progressively lifted as people manage to earn more money. This reinforces the effect described in the paper!