Introduction

Despite being central to executive governance and coalition politics, the design of government portfolios in Western European democracies has remained largely unstudied. This paper argues that portfolio allocation decisions follow predictable political dynamics.

* Data & Methods: We analyze comparative data on portfolio reforms across nine nations (France, Germany, Italy, Spain, UK, Belgium, Netherlands, Sweden, Switzerland) from 1970 onward.

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Key Findings:

Our analysis reveals two main insights:

* Portfolio changes occur frequently - an average of once annually since the 1970s.

* These shifts are most likely triggered by leadership transitions (new Prime Minister) or government composition changes (party makeup).

* Implications:

These findings demonstrate a clear political logic behind portfolio allocation, directly challenging assumptions that complex institutional structures resist frequent adjustment. This work significantly advances our understanding of both descriptive representation and the dynamics of institutional design.