Danny Sriskandarajah, until recently of the Institute for Public Policy Research in London, notes another concern about changing public moods.
The estimates were based on registration figures, data from the Labour Force survey and analysis by the Institute for Public Policy Research.
Ms Armstrong was speaking at the Institute for Public Policy Research, Sunderland.
BBC: NEWS | UK | UK Politics | Minister to target poor families
But in some areas like schools and hospitals, the cost savings are as low as 3%, according to the Institute for Public Policy Research.
Nick Pearce, of the Institute for Public Policy Research, speculates that previous bouts of widespread rioting, such as in 1981, demanded a response because they were fuelled by racial grievances.
But Tony Grayling, associate director of the Institute for Public Policy Research (IPPR), warned that simply building to meet demand would repeat the mistake made in road policy during the 1980s.
BBC: NEWS | UK | Politics | Split views ahead of airport decision
However the Institute for Public Policy Research in its recent report on childcare costs, Double Dutch, said this figure wrongly incorporated elements which should not be classified as childcare, such as the cost of school for five and six year olds.
The Institute for Public Policy Research also backed the move, arguing that younger people were facing record unemployment and cuts to benefits like education maintenance allowance, and it was "time for older people to share some of the burden of deficit reduction".
He had also served as vice president of public policy at the National Center for Policy Analysis, a Dallas-based conservative public policy research institute.
David Berman, a senior research fellow at Arizona State University's Morrison Institute for Public Policy, said some will likely disapprove of a recall so soon after the November general election, making the prospect of ousting Arpaio a long shot.
应用推荐