Unemployment and sick leave also have a left effect. This safety net offers a minimum to which wages and working conditions can drop. If it's too terrible, you get sick and then the employer is forced to think about how things are at their workplace. A salary minimum in the unemployment fund for which jobs you need to apply for means that wages cannot drop as low as you like. Therefore, a generous social security system is important to create a decent floor for wages and working conditions.
And anyone who wants to be a diligent job seeker and looks for worse jobs than he needs is only doing his professional colleagues a disservice, by not making the safety net work as it should.