stylistic:tone
Supply-side factors

Supply-side explanations focus on political actors and institutions and the ways in which governments may fail to respond to the changing conditions that affect citizens. Economic, social, and other structural trends are seen as being modified by institutions as they determine political outcomes. In this view, citizens turn to populism when governments do not respond effectively to the challenges they and their citizens face. Research supports the idea that populism is more likely to thrive when mainstream parties on the center-left and center-right do not address important contemporary issues and do not offer clear alternatives to voters. Coalitions that blur distinctions on positions are also likely to increase populism.

Economic and/or social changes alone are not problems—they only cause citizens to become angry, resentful, and susceptible to the appeal of populists if established mainstream politicians, parties, and governments fail to recognize and respond to them.

Sheri Berman

In Political Order in Changing Societies (1968), Samuel P. Huntington argues that rapid change (social or economic) in a society will increase the demands of its citizens. Unless political institutions are responsive and effective, they are unlikely to respond to and satisfy such demands. If political systems are weak or have become unresponsive over time, then dissatisfaction, political disorder and even violence become more likely. Political institutions that do not respond to social and economic changes are likely to fail. Responsive political systems can adapt to more severe challenges than unresponsive ones. Huntington's ideas grew out of work on Third World countries, but are also applicable to advanced industrial countries.

In a supply-side view of American politics, populism can be seen as a symptom of institutional decay. It can be suggested that political factors such as gerrymandering, the Electoral College, special-interest lobbying and dark money, are distorting political and economic debate, and decreasing the ability of the government to respond to the concerns of large numbers of citizens. This in turn generates dissatisfaction, which may increase the likelihood that citizens will support populism. Scholars studying the European Union have suggested that European integration may have had the undesired effect of decreasing the system's responsiveness to voters, as law and policy-making increasingly became the responsibility of the European Union. This too may have increased support for populism. Institutions such as the European Central Bank may also distance decision-making from electoral power. It has been argued that political parties themselves have become disconnected from society, and unable to respond to citizen's concerns.