Technology
The Influence of Coalition Agreement Length on Government Policy Stability
Quick fact
Research on coalition governance shows that longer coalition agreements are associated with more stable governments and less policy volatility, because they specify policy compromises in detail, reducing the risk of misinterpretation and conflict. For example, in Germany, coalition agreements have grown from about 20 pages in the 1960s to over 170 pages in recent decades, correlating with more stable governments.
Why this is interesting
Why do some coalition governments last for years while others collapse in months? One surprising factor: the length of the written agreement they sign.
Read the full explanation
Understanding The Influence of Coalition Agreement Length on Government Policy Stability
Imagine you and a friend decide to go on a road trip. If you only say 'we'll go somewhere nice,' you might argue about the destination. But if you write down the route, the stops, and the budget, you're more likely to agree and enjoy the trip. Coalition agreements work similarly. When political parties form a government, they must agree on many policy issues: taxes, welfare, infrastructure, and more. A short agreement might say 'we'll improve healthcare,' leaving the details vague. A long agreement spells out exactly how much money, which reforms, and when. This clarity helps because each party knows exactly what they’ve signed up for. It sets expectations, reduces misunderstandings, and makes it harder for one party to later claim they never agreed to something. So, longer agreements lead to more predictable behavior and less chance of a fight breaking out, which keeps the government stable.
A deeper explanation
The underlying mechanism is that coalition agreements serve as commitment devices. Politics is full of uncertainty, and parties may be tempted to deviate from promises once in power. A detailed agreement increases the political cost of violating it: party leaders can point to the text and say 'you agreed to this,' and voters can hold them accountable. Moreover, the process of writing a detailed agreement forces parties to clarify their preferences and find compromises, reducing the chance of unanticipated conflict later. This is especially important in multiparty systems with many veto players—parties whose agreement is needed for policy change. With more veto players, the policy space is crowded, and any deviation risks blocking legislation. A lengthy agreement pre-negotiates these policy details, effectively 'locking in' decisions and reducing the need for last-minute negotiations. Consequently, governments with longer agreements show more consistent policy output and lower risk of collapse. This is why political scientists, such as those studying Germany and the Netherlands, find a positive correlation between agreement length and government longevity.