Progressive degree of progressive tax rate depends on the type of Social welfare function and labour supply elasticity.

累进税率的累进程度取决于社会福利函数的类型和劳动供给弹性的大小。

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Frank Field, a former Labour welfare minister, thinks these things, together with worries about unaffordable housing, are shifting the consensus on levels of taxation that has remained intact for decades.

ECONOMIST: Income inequality

One of its chief concerns is to ease the regulatory burden on small businesses, especially the Working Time Directive and other EU labour and welfare legislation.

BBC: Ed Miliband: PM's EU strategy 'incredibly dangerous'

On the face of it then, it seems that there has been a convergence of the Conservatives' and Labour's welfare policies.

BBC: Unit 4: Political issues