Using hand-collected data on divisional managers at conglomerates, we find that a change in industry surplus in one division generates large spillovers on managerial payoffs in other divisions of the same firm. These spillovers arise only within the boundaries of a conglomerate but not between...

This paper exploits a novel hand-collected dataset to provide a comprehensive analysis of the social relationships that underlie illegal insider trading networks. I find that inside information flows through strong social ties based on family, friends, and geographic proximity. On average,...