Labour and employment are treated in exactly the same way as apples and oranges on a street market. If workers demand higher wages (than the equilibrium) then fewer of them will be employed and there will be unemployment. However, if they were prepared to accept lower wages then supply and demand would once again coincide and full employment would return. All that is necessary is for Say’s law to operate. Say’s law states that the wages and profits paid out during production are equal to the total sum required to buy the goods produced, which therefore can always be sold. In effect production is the source of demand and aggregate production necessarily creates an equal quantity of demand. For Say’s law to work there should be no “artificial” interference in labour markets—such as minimum wages, welfare benefits or pressure from trade unions.