Always will I'm afraid. Vouchers will always be easily converted to cash. Lets take food vouchers for example. I'm an entrepreneur, I sell the customer say sugar using the food vouchers and then buy the sugar back at a reduced price. Benefit recipient gets cash and I make a margin. Unless you're going to start making it illegal for benefit recipients to sell stuff, this will happen. You may as well put the cash in the hands of the benefit recipient than me the entrepreneur.
But the fact remains clear that it is harder to exchange Food vouchers for Xboxs/Apple products/drugs than it is to exchange cash for such items. The harder it is for these people to waste their money on junk the better.
Of course you're going to have people who are going to fiddle the system. That doesn't mean you should make it easy and just give them the cash in hand.
The fact is, you can't compare situations to single adults. Single adults on benefits get pittance.
I didn't and I know.
This quite simply is empirically false. Childhood income has a bearing on life outcomes (that's not to say the marginal returns from having more generous benefits don't decline). Where studies tell us, society is failing is in education.
And growing up in an environment where mummy doesn't work but yet is able to live a perfectly good and relativity prosperous life is really going to inspire a fantastic work ethic into these kids.
I don't buy the education nonsense either. If you want to work/learn you can. No ifs, No buts.
The problem is that so many people don't want to. Why work when you can knock up a bird and get more money than you would working an entry level job for minimum wage?
The benefit system can encourage large families. However, it also benefits people. There is a cost benefit analysis to perform here, and the causation between benefits -> large families has been shown to be weak. Other factors more easily explain large families.
Do you not agree that the current system makes it far too easy for people to "decide" to have these large families?
I understand that the cases highlighted in the Daily Mail are usually one offs, but even then on the whole the benefit system is a bit of a mess.

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