• Instructions to Participants

• High-Cost Subjects in the Agent-Based Model

• Incentives for Cross-Boundary InformationAcquisition

• Patterns of Change across the Periods

Table A1: Agent-Based Simulations of Cross-Group Communication for All Subjects: Group Transition Rates with Implied Equilibria.

Table A3: Determining the Value of Private Information. Results from One Million Simulations by Candidate Positions and Private Information Signals.

Table A4: Replicating Table 2A with Data Split between Early and Late Periods. Prior Judgments Regarding Candidates' Positions by Information Purchased, Candidates' True Positions, and Their Interaction.

Table A5: Mean Number of In-Group and Out-Group Requests Subjects Received by Period.

Figure A1: Social Information Exchange over Time.

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