Professor Richard Layard of the London School of Economics: "There is a paradox in our lives. Most people want higher and higher incomes and work tirelessly for it. But although western society is getting richer, people do not feel happier. Economic growth does not necessarily make people happier. It is futile for the masses to pursue material wealth. The more likely result is to make people less happy. According to Richard Layard, which of the following statement is incorrect? ["Happiness has nothing to do with people's income.", 'People with higher incomes are less happy.', 'People who want happiness should not have a high income.', 'Happiness is not only measured by income.']