In a labor supply and demand graph, what is structural unemployment primarily caused by?

Structural unemployment occurs when there is a mismatch between the skills that workers have and the skills that employers need. This can happen due to changes in technology or shifts in the economy that make certain jobs less relevant. For example, if a factory that produces typewriters closes down because most people now use computers, workers who only know how to make typewriters may struggle to find new jobs. They may need to learn new skills to be able to work in a different industry, like technology or services. This type of unemployment is not caused by a lack of jobs in general, but rather by the specific skills required for available jobs.