In the social welfare area, there are also perpetual disputes about the extent to which unemployment is voluntarily chosen by people, or involuntary, whether it is forced on people or whether it is their own choice.[19] In the Great Depression of the 1930s, when unemployment rose to 20–30% of the working population in many countries, people generally believed it was involuntary, but if unemployment levels are relatively low, the argument that unemployment is a matter of choice is more often heard.[20] It could be that there simply are no jobs for the unemployed, but it could also be that there is a mismatch between the skills that the unemployed have and the type of skilled labour for which there is a demand.