I am from Poland and I've seen that Job Guarantee policy in action when our country was ruled by communists. It ends in disaster: companies are forced to hire more people than they need to do the job, employees come to their workplace and have nothing to do so they spend a whole day chatting, doing nothing, sometimes even drinking alcohol as a way to fight boredom. At the end of the month they all receive a paycheck, which quickly leads company to bankruptcy but since goverment promised everyone Job Guarantee it has to support bankrupting company with some money to continue operating. This leads to a huge debt and eventualy bankruptcy of a whole country, as it was the case of Poland in 1980s