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This prelude introduces the first symposium of this journal devoted to the structure, conduct, and performance of principal-agent models in a broad view. Five papers, exemplifying recent developments and targeting readers of interdisciplinary interest, are summarized.

This paper analyzes equilibrium health insurance premium dependencies on signaling costs given individual health states, risk types, and risk type attributes. Since precise determination of an individual's premium is costly, insurers can categorize insureds based on relative screening costs. We...