This prefix denotes a research program that titles a Duranton and Puga paper analyzing sharing, matching, and learning mechanisms of urban agglomeration. Decision analyst Ronald Howard created a unit that uses this prefix to measure a type of risk. Robert Lucas claimed Keynesian economics lacked principles whose name (10[1]-5[1])begins (10[2])with this prefix. (10[1])A branch of economics (-5[1])named (-5[1])for this prefix was expanded by John Hicks’s book Value and (-5[1])Capital. “Foundations” named for this prefix study agents’ behavior (10[1]-5[1])in the context of a whole economy. (10[1]-5[3])A branch (10[1]-5[2])of economics (10[1]-5[1])with this prefix is applied to evaluate a society’s well-being (-5[1])in (-5[1])welfare economics. (-5[1])For 10 points, name this prefix that names a branch of economics studying the decisions of firms (0[1])and individuals. (10[2])■END■ (10[9])