Simplify the following text for a Grade 11 native English-speaking person.
Original: Constitutional economics is a research program in economics and constitutionalism that has been described as extending beyond the definition of ` the economic analysis of constitutional law ' in explaining the choice `` of alternative sets of legal-institutional-constitutional rules that constrain the choices and activities of economic and political agents . ''
Simplified: Constitutional economics is a program of joint study of economics and constitutionalism . It is often described as `` the economic analysis of constitutional law . ''