And all you'll ever get is anecdote if you look in the U.S. The "welfare professionals" (let's define this term to mean those that know precisely the minimum of effort to maintain the illusion of 'seeking gainful employment' in order to keep their handouts) keep a low-profile and compartmentalize well. Going to the welfare office today? Don't wear new/"in" clothing, don't take the iDevice with. Out and about socially? Maintain the appearance of not actually being on welfare of any sort: wear the nicer clothing, expose the iDevice prominently. And they can't have their children mocked and ridiculed at school for not fitting in as well, so they need their own iDevice as well.
It's anecdote because there's no data. There's no data because who'd admit to cheating the system? There's no cause for investigation due to compartmentalization-- none of their intended social circle knows they're on welfare; any that do are also on welfare and doing the same thing.
How would I, a "technocrat" making about six figures know this? Because a couple times in my life I've had to take advantage of this safety net. And I was always irritated at how people I'd seen entering and leaving the welfare office had so much material crap that I couldn't afford when I'd see them again out in public. There were several occasions where some of these welfare recipients were running businesses and hired me to perform computer repair, then in the offices I'd here them on the phone discussing with others how to game a particular part of the system. Disheartening.
You want /data/ on this? Good luck.