Core of the model
Wlezien (1995) treated the share of people saying the government should spend more on areas such as defense or welfare as relative preference. When policy falls below what citizens want, "more" responses rise; when spending increases, they fall. In US data, preferences for more defense spending fell after defense spending rose, showing opinion responding inversely to policy change. Opinion thus works both as a signal of desired direction and as a thermostat that senses policy change.
Opinion–policy interaction
Page and Shapiro (1983) showed that large opinion shifts are often followed by policy change. Stimson (1991) measured the general direction of opinion as policy mood, and Stimson et al. (1995) presented dynamic representation, in which mood moves congressional and presidential policy. The thermostatic model adds feedback in the opposite direction, explaining an equilibrium process in which opinion settles once policy follows it. Wlezien (2004) reported that responsiveness is stronger in salient domains such as defense and welfare.
Comparative research and significance
Soroka and Wlezien (2005) confirmed thermostatic responses in UK data, and Soroka and Wlezien (2010) offered a comparative analysis showing that the strength of the opinion–policy link varies with institutions such as federalism and separation of powers. The model shows that even if individual citizens know little about policy details, the public collectively can respond sensibly to policy change, providing an optimistic basis for democratic representation. Critics note that responsiveness may weaken in low-information domains or where partisan motivated reasoning is strong.
FAQ
- What is the thermostatic model in simple terms?
- Just as you turn the heat down when a room is hot and up when it is cold, opinion shifts toward "less" when policy overshoots and "more" when it falls short.
- Does it work if citizens know little about policy?
- The model's claim is that even if individuals know little, aggregated preferences show a pattern of responding to policy change.
Sources reviewed: 2026-10-26
References
- Page, B. I., & Shapiro, R. Y. (1983). Effects of public opinion on policy. American Political Science Review, 77(1), 175–190. Classic evidence that opinion shifts drive policy.
- Wlezien, C. (1995). The public as thermostat: Dynamics of preferences for spending. American Journal of Political Science, 39(4), 981–1000. The original thermostatic model paper.
- Stimson, J. A. (1991). Public opinion in America: Moods, cycles, and swings. Westview Press. Book introducing policy mood.
- Stimson, J. A., MacKuen, M. B., & Erikson, R. S. (1995). Dynamic representation. American Political Science Review, 89(3), 543–565. Dynamic representation of policy mood.
- Wlezien, C. (2004). Patterns of representation: Dynamics of public preferences and policy. The Journal of Politics, 66(1), 1–24. Representation varies across policy domains.
- Soroka, S. N., & Wlezien, C. (2005). Opinion–policy dynamics: Public preferences and public expenditure in the United Kingdom. British Journal of Political Science, 35(4), 665–689. UK test of the model.
- Soroka, S. N., & Wlezien, C. (2010). Degrees of democracy: Politics, public opinion, and policy. Cambridge University Press. Comparative book on institutions and thermostatic response.