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There is only one type of job: Doing something someone else doesn't want to do.
(self.showerthoughts)
A "Showerthought" is a simple term used to describe the thoughts that pop into your head while you're doing everyday things like taking a shower, driving, or just daydreaming. The best ones are thoughts that many people can relate to and they find something funny or interesting in regular stuff.
No, for all jobs there is only limited supply. If more people want the job than there are jobs available, some of the people who want the job must necessarily end up not getting the job.