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<p>Economists use the conceptual framework of <a href="page.php?w=Supply_%28economics%29">supply</a> and <a href="page.php?w=Demand_%28economics%29">demand</a> to distinguish between the behavior and incentive systems of firms and consumers. Like many other conceptual frameworks, supply and demand can be presented through visual or graphical representations (see <a href="page.php?w=demand_curve">demand curve</a>). Both <a href="page.php?w=political_science">political science</a> and <a href="page.php?w=economics">economics</a> use <a href="page.php?w=Principal-agent_problem">principal agent theory</a></p><p>
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