In this task, we ask you to rewrite a sentence in simple English without changing its general meaning. Essentially, you want to make the sentence easier to read by using simpler words, utilizing more straightforward sentence structures, and omitting non-essential information etc.
Q: Constitutional economics is a research program in economics and constitutionalism that has been described as explaining the choice " of alternative sets of legal-institutional-constitutional rules that constrain the choices and activities of economic and political agents " .
A: 
Constitutional economics tries to explain the selection of constitutional rules " limiting the choices and activities of economic and political agencies . "