The paper reports on the methodology, design and outcome of a large auction with multiple, interdependent markets constructed from principles of general equilibrium as opposed to game theoretic auction theory. It distributed 18,788 entitlements to operate electronic gaming machines in 176 interconnected markets to 363 potential buyers representing gaming establishments subject to multiple policy constraints on the allocation. The multi-round auction, conducted in one day, produced over $600M in revenue. All policy constraints were satisfied. Revealed dynamics of interim allocations and new statistical tests provide evidence of multiple market convergence hypothesized by classical theories of general equilibrium. Results support the use of computer supported, "tâtonnement–like" market adjustments as a reliable empirical processes and not as purely theoretical constructs.