@article{Kolm1998b,
	title = {Differentiated payroll taxes, unemployment, and welfare},
	author = {Ann-Sofie Kolm},
	day = {01},
	journal = {Journal of Public Economics},
	month = {Nov},
	number = {2},
	pages = {255--271},
	url = {http://www.sciencedirect.com/science/article/B6V76-3TWYC99-4/1/75c44b37f936efa2a558f39c8ff1f5ef},
	volume = {70},
	year = {1998},
	biburl = {http://www.bibsonomy.org/bibtex/27ab6d818a328418ff3877aaa63dd5127/smicha},
	keywords = {Imperfect competition }
}