People who work in those industries are usually employed for six month and unemployed for the other six when there industry is off-season.
Frictional unemployment is the unemployment that corresponds to job vacancies in the same occupations and locations. Some workers will be frictionally unemployed because of job search. Workers will try to better themselves when they perceive a chance of an improved employment situation by leaving their present employer. For example, moving from a job paying a low wage to a higher paying position will tend to be associated with higher productivity in the new position, leading to an increase in economic output. In this case the worker gains, and so does society. An economy where workers are not involved in self-interested job searches would not be economically progressive. Even if the size of the labor force remained the same, new workers are likely to join the frictionally unemployed, while others will be leaving the labor force. .
There are two types of demand deficient unemployment. The first is cyclical unemployment and the second is chronic unemployment. Cyclical unemployment results from a general lack of demand for labor. When the business cycle turns downward, demand for services and goods drop. Consequently, workers begin to be laid off. Chronic unemployment is caused by factors beyond the control of the individual workers. If it is long lasting, the rise of unemployment will not have an even occurrence on the entire labor force. As the workers are laid off, the fall in consumption will have its most severe impact on the purchases of cars, appliances, etc. Workers in those industries will bare the brunt of unemployment. The remedy for demand deficient unemployment is government intervention through macro-economic monetary and fiscal policies.
Economists believe that in order for the economy to expand and grow, there has to be some level of inflation.