Natural unemployment is often defined as the lowest rate of unemployment an economy will reach. It is “natural” because its causes are things other than the problems caused by a bad economy. For instance, one part of natural unemployment is frictional unemployment. This type of unemployment is caused by situations like new graduates just starting their search for a job, people leaving a job to move to another city, or people quitting their jobs to look for a better one. No matter how robust the economy is, there will always be people who are unemployed while in such situations. Another part of natural unemployment is structural unemployment, which is where workers fail to find jobs and employers with available jobs fail to find workers.  This problem is created by some inherent long-term change in the economy.  Two of the most common economic changes creating structural unemployment are technological advances and rapid relocation of available jobs.  Another factor that makes up natural unemployment is surplus unemployment.  This occurs when wage controls are put in place by unions or minimum wage laws.  This causes employers to cut their workforce to stay within budgetary constraints.  Even when an economy is running at full strength, these types of unemployment will still occur. There is no economic or market “fix” for them. This is why most economists state that when an economy reaches the natural unemployment rate, the economy is at full employment. Most economists agree that the natural rate of unemployment is around 4%.