Mr Duncan Smith said his plans were designed to reduce welfare dependency and make work pay.
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But getting the incentives wrong can lead to welfare dependency for generations of the poor.
Medicaid patients face greater socioeconomic obstacles: something that can be exacerbated, if not caused, by welfare dependency.
They have little desire to replace traditions of hard work and thrift with a flabby welfare dependency.
What Rudy Giuliani did to improve quality-of-life conditions and to decrease crime and welfare dependency is well- known.
Our nation has confronted welfare dependency, but our work is only half done.
Put simply, we will never control immigration properly unless we tackle welfare dependency.
They will never allow local voluntary organisations to take over welfare provision - and so they will never tackle welfare dependency.
The social costs of family breakdown, welfare dependency, educational failure, crime, anti-social behaviour, drug and alcohol addiction are impossible to calculate.
Speaking in a BBC Northern Ireland interview, he said welfare dependency had harmed too many parts of the UK, including Northern Ireland.
He said government was "making the system more affordable" and "better able to tackle unemployment and welfare dependency and creating the right incentives by ensuring work always pays".
These benefits can tempt the jobless into welfare dependency.
"I think it's a correct call for Kiri to finger the hard-core of unemployed and that's a clarion call to politicians, to policymakers to come up with some solutions to that problem to get people off welfare dependency, " he said.
"This was supposed to be the silver bullet that was going to end welfare dependency, but now the policy is spinning out of control and world-respected organisations are joining the chorus warning Universal Credit simply won't be fit for purpose, " he said.
He said there is "a pressing need to reform the welfare system" and tackle the problems of poverty and dependency on welfare by "ensuring that work pays and is seen to pay".
Yes, you can have too much welfare and too much dependency on the state.
To encourage opportunity and jobs rather than dependency and welfare, we will propose that individuals living at or near the poverty line be totally exempt from Federal income tax.
The incremental approach mitigates the risk of the kind of dependency that welfare states had unwittingly fostered in the poor in the past and doesn't undermine slum dwellers' sense of personal agency.
We broke the cycle of dependency, reestablished welfare as the safety net it was meant to be and cut costs significantly.
The aim was to avoid the twin plagues of welfare: handouts that encourage dependency, and the hijacking of funds by corrupt functionaries or vote-grubbing politicians.
The right policy is a growing economy, non-burdensome immigration laws, a welfare system which promotes work, not dependency, and a culture of assimilation, not isolation.
To cure the ills of single-parenthood, benefit-dependency and the like, he proposes a tougher welfare regime (though not all that different from the government's), tangible if unspecified support for marriage through the tax system and more job flexibility for parents.
There are all too many Americans that have taken the bait offered by our myriad of welfare programs, and have self-selected into learned helplessness and lifetime dependency.
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Mr Duncan Smith's overarching message is that cultural change is required - both in the minds of those on benefits and in government - so that the welfare system is a springboard into work, rather than something which traps people into a life of dependency.
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