The rise of the zzp'er (self-employed professional) in the Dutch construction industry

55% of all carpenters are self-employed (zzp’er), 37% of plasterers and wall-/floor finishers is zzp’er, and 28% of the bricklayers and interpolators is zzp’er. Of all the work in the construction sector, zzp’ers now do 15%. Is there something special about these people or the construction industry and where do these characteristics originate in...