I don't have a problem with that, as long as the 50h/week is reflected in the contract and stated during the wage negotiation. The problem is that often(?) it's

I don't have a problem with that, as long as the 50h/week is reflected in the contract and stated during the wage negotiation. The problem is that often(?) it's not, so you can't know your true wage until you've changed the employer and there's no turning back.