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Not enough pay is a big one for many due to the cost of living. At the same time, I think employers are "overpaying" some younger workers, but aren't getting much out of them. It is like they are taking up seats, but not adding value.

The main problem at my place is that it can take up to 6 months from the succesfull interview until the starting date, with current economy, who can afford to wait 6 months for an average job?