An interesting case is Saudi Arabia that pretty much runs on free oil money. Saudi nationals are notorious for having bad work ethics, and they have to import many foreign workers to run the economy. To prepare the country for a post oil world companies are required to hire a minimum percentage of Saudi nationals.
We've got several demographics that have their basic needs covered without working. Not all are directly comparable with working peers, but surely some likely outcomes could be predicted.
An interesting datapoint since you mentioned that group.
1982 $1,000.00 1983 $386.15 1984 $331.29 1985 $404.00 1986 $556.26 1987 $708.19 1988 $826.93 1989 $873.16 1990 $952.63 1991 $931.34 1992 $915.84 1993 $949.46 1994 $983.90 1995 $990.30 1996 $1,130.68 1997 $1,296.54 1998 $1,540.88 1999 $1,769.84 2000 $1,963.86 2001 $1,850.28 2002 $1,540.76 2003 $1,107.56 2004 $919.84 2005 $845.76 2006 $1,106.96 2007 $1,654.00 2008 $2,069.00 2009 $1,305.00 2010 $1,281.00 2011 $1,174.00 2012 $878.00 2013 $900.00 2014 $1,884.00 2015 $2,072.00 2016 $1,022.00 2017 $1,100.00 2018 $1,600.00 2019 $1,606.00
If simply giving people money left them more successful at getting a new job, there would really not be any point in all the CV theatre a jobseeker routinely needs to perform.
In fact I'm confused why this keeps being 'tried' like its some new idea.