Other scholars of the social sciences have defined the term "populism" differently. According to the popular agency definition used by some historians of United States history, "populism" refers to popular engagement of the population in political decision making. An approach associated with the political scientist Ernesto Laclau presents populism as an emancipatory social force through which marginalised groups challenge dominant power structures. Some economists have used the term in reference to governments which engage in substantial public spending financed by foreign loans, resulting in hyperinflation and emergency measures. In popular discourse—where the term has often been used pejoratively—it has sometimes been used synonymously with demagogy, to describe politicians who present overly simplistic answers to complex questions in a highly emotional manner, or with opportunism, to characterise politicians who seek to please voters without rational consideration as to the best course of action.