Which type of unemployment is caused by a lack of demand for workers as a result of a shrinking economy?

Believe the original question should have asked which jobs are prone to out sourcing, the state of the economy, taxes for companies, regulations enforced upon US companies etc. This line of questioning provides a more true way to obtaining an answer. I can say with confidence which jobs are in demand and you can walk it back to your question. The federal and state government employs the most unionized jobs. This can be verified as private union membership is at an all time low, while the public unions ( which rely on taxpayer dollars) is thriving. Fed gov employees seem to hold their jobs for life, never facing layoffs due to external financial woes, outsourcing, companies moving to other countries (so they can compete in a global market), where as these conditions have a powerful impact for the private sector. Basically public jobs are for life . Euro style in the US on the taxpayers dime.