Debate on causes

There is considerable debate among economists as to the causes of unemployment. Keynesian economics emphasizes unemployment resulting from insufficient effective demand for goods and service in the economy (cyclical unemployment). Others point to structural problems, inefficiencies, inherent in labour markets (structural unemployment). Classical or neoclassical economics tends to reject these explanations, and focuses more on rigidities imposed on the labor market from the outside, such as minimum wage laws, taxes, and other regulations that may discourage the hiring of workers (classical unemployment). Yet others see unemployment as largely due to voluntary choices by the unemployed (frictional unemployment). On the other extreme, Marxists see unemployment as a structural fact helping to preserve business profitability and capitalism.
Though there have been several definitions of voluntary and involuntary unemployment in the economics literature, a simple distinction is often applied. Voluntary unemployment is attributed to the individual unemployed workers (and their decisions), whereas involuntary unemployment exists because of the socio-economic environment (including the market structure, government intervention, and the level of aggregate demand) in which individuals operate. In these terms, much or most of frictional unemployment is voluntary, since it reflects individual search behavior. On the other hand, cyclical unemployment, structural unemployment, classical unemployment, and Marxian unemployment are largely involuntary in nature. However, the existence of structural unemployment may reflect choices made by the unemployed in the past, while classical unemployment may result from the legislative and economic choices made by labor unions and/or political parties. So in practice, the distinction between voluntary and involuntary unemployment is hard to draw. The clearest cases of involuntary unemployment are those where there are fewer job vacancies than unemployed workers even when wages are allowed to adjust, so that even if all vacancies were to be filled, there would be unemployed workers. This is the case of cyclical unemployment and Marxian unemployment, for which macroeconomic forces lead to microeconomic unemployment.
Some say that one of the main causes of unemployment in a free market economy is the fact that the law of supply and demand is not really applied to the price to be paid for employing people. In situations of falling demand for products and services the wages of all employees, from president to errand boy, are not automatically reduced by the required percentage to make the business viable. Others say that it is the market that determines the wages based on the desirability of the job. The more people qualified and interested in the job, the lower the wages for that job become. Based on this view, the profitability of the company is not a factor in determining whether or not the work is profitable to the employee. People are laid off, because pay reductions would reduce the number of people willing to work a job. With fewer people interested in a particular job, the employees bargaining power would actually rise to stabilize the situation, but their employer would be unable to fulfill their wage expectations. In the classical framework, such unemployment is due to the existing legal framework, along with interferences with the market by non-market institutions such as labor unions and government. Others say many of the problems with market adjustment arise from the market itself (Keynes), or from the nature of capitalism (Marx).
In developing countries unemployment is often caused by burdensome government regulation. The World Bank's Doing Business project shows how excessive labor regulation increases unemployment among women and youths in Africa, the Middle East and Latin America.