S P & A  0144–5596 V. 39, No. 7, D 2005, . 764 –785 © 2005 The Author(s) Journal Compilation © 2005 Blackwell Publishing Ltd,  Garsington Road, Oxford OX DQ , UK and  Main Street, Malden, MA , USA Blackwell Publishing, Ltd. Oxford, UK SPOL Social Policy & Administration - © Blackwell Publishing Ltd.  December   Original Article XX XX When Do Benevolent Capitalists Change Their Mind? Explaining the Retrenchment of Defined-benefit Pensions in Britain Paul Bridgen and Traute Meyer Abstract This paper explores the politics of welfare retrenchment, but differs from much of the current literature in this area by focusing not on the decisions of politicians but those of private sector employers. In countries with a large private welfare sector, employers are major social policy players with a significant influence on the generosity of welfare provision, but the rationale behind their actions is not well understood. To explore these issues, a case study is used of the recent funda- mental change in UK occupational pension provision, involving a rapid shift from defined-benefit to defined-contribution pensions. The paper shows by means of a micro-simulation of the relative performance of defined-benefit, defined-contribution and state pensions that this shift represents a significant retrenchment. It suggests, using historical material, interview data and insights from behavioural economics, that existing explanations for this change, while valuable, have important gaps because they are based on too narrow a conceptualization of business motives. In this regard, the paper highlights the importance of herd behaviour. Keywords Occupational pensions; Employers; Retrenchment; Britain; Private social policy-making; Herd behaviour Introduction Over recent decades a lot of thought has been given to the causes that prompt welfare states to contain spending, to retrench, or to adjust to new modernization challenges despite declining resources. Considerable attention has also been paid to the strategies politicians employ when retrenching key programmes. How can they remain popular despite cuts? What alliances do they need to achieve a reduction in spending? How have they built new redistributive equilibria? Address for correspondence: Paul Bridgen, Traute Meyer, School of Social Science, University of Southampton, Highfield, Southampton, SO BJ. Email: Paul.Bridgen@soton.ac.uk; T.Meyer@soton.ac.uk