But he told MPs last week he favours the most ambitious of these - scrapping all current out-of-work benefits in favour of a single payment, which would be tapered to encourage people back into work.
Under the changes six benefits, including housing benefit, would be brought together in a single, monthly Universal Credit payment.
It is an "open secret" in Whitehall that the plans, which aim to bring most benefits and tax credits under a single payment called the "universal credit", are in trouble, Mr Byrne claimed in the Commons.
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But no matter what the payment details are, every type of financial instrument is a promise, a promise of payment in the future, and so every single one of them presents an important question: How do I compare the value of money invested now, with money which I expect to receive in the future?
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Orkney MSP said the new rules had resulted in higher levels of penalties due to unintentional errors in livestock paperwork and a new interpretation of land eligibility rules for Single Farm Payment (SFP) claims or Less Favoured Area Support Scheme (LFASS).
In 2007 analysts at MBIA had started noticing strange things in the loan pools, such as mortgages that went into default without a single payment being made.
Ministers say it marks the beginning of a fundamental cultural shift in the welfare system, but critics have raised concerns about the computer system and the switch to a single monthly payment.
Dr Royston feels entitlement should be extended to all children living in families receiving Universal Credit - the new single payment for people who are looking for work or on a low income.
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