Nicholas C. Yannelis (Greek: Νικόλαoς Γιανvέλης; born 1953) is the Henry B. Tippie Research Professor of Economics and Applied Mathematics and Computation at the University of Iowa.
Nicholas C. Yannelis's early work was focused on infinite dimensional general equilibrium theory and the Aumann-Shapley value allocation.
To study new problems in general equilibrium theory, Yannelis proved new mathematical results, including continuous selection theorems, Caratheodory-Type Selection Theorems,[1] the Fatou’s Lemma[2] in infinite dimensional spaces, fixed points for discontinuous correspondences,[3] and the upper and lower semicontinuity of set-valued functions in Banach spaces.
His analysis of payoff discontinuity extends the classical results in abstract economies with non-ordered preferences.
He has shown that there is no conflict between efficiency and incentive compatibility in the presence of maximin expected utilities, which is generally false in a model with Bayesian decision making agents.