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Sometimes the best person for the job isn't the most qualified.
For example, someone that didn't do well at school may well be the best shelf filler a supermarket could ever need, happy that they are employed, content to do the job for life with no wishes to move on. Once trained a reliable employee.
However life and the dole will push a far more qualified person to take that job as a stop gap until they can get a decent interview for a job they are capable of doing. Is this fair? They will no doubt shine at the shelf filler interview and if taken on deprive the 'real shelf filler' from their job of a life time, sometimes just taking any job even if temporary is the wrong thing to do and should not be encouraged.