Abstract
This survey covers the developments in the theory of the recoverability of unobserved fundamentals from observable variables in general equilibrium models. Concretely, suppose one observes equilibrium prices that vary with the profiles of individual endowments. What inferences can be made about individuals’ preferences? What are the local restrictions on the map, from profiles of endowments to prices? Suppose one only has finitely many observations. What inferences about individuals’ preferences can be made as the number of observations becomes large?