Inflexible , huge employer costs (highest costs in the world for employment),...
Because of the taxes, employers don't want you to work extra hours and as an employee, you don't have much benefit of it (governement taxes that A LOT if you do overtime).
Some things that are forbidden (or pay extra taxes)
- Only normal hours (5 days a week, ...)
- Don't employ people outside of their working schedule
- forbidden to work on Sundays
- forbidden to work on Holidays
- Don't work at night
But there are exceptions (but it's complicated)