Glaeser, Laibson, Scheinkman, and Soutter (2000) measure trust and trustworthiness using experiments and surveys. They find that standard attitudinal questions about trust poorly predict trusting behavior in experiments, but past trusting behavior is a better predictor. Trust and trustworthiness increase when individuals are socially connected, and trustworthiness decreases when partners are of different races or nationalities. High-status individuals elicit more trustworthiness from others. The study integrates experiments with surveys to measure individual-level variation in trust and trustworthiness. They find that social connections, such as shared friends and longer acquaintance, predict trust and trustworthiness. Trustworthiness declines when partners are of different races or nationalities. Background characteristics, such as education and organization membership, predict trustworthiness. The study also finds that trust is influenced by social capital, with more educated individuals and members of volunteer organizations earning more in the experiment. The results suggest that trust and trustworthiness are influenced by social connections, race, nationality, and individual characteristics. The study highlights the importance of measuring trust and trustworthiness through experiments and surveys to understand their role in social capital.Glaeser, Laibson, Scheinkman, and Soutter (2000) measure trust and trustworthiness using experiments and surveys. They find that standard attitudinal questions about trust poorly predict trusting behavior in experiments, but past trusting behavior is a better predictor. Trust and trustworthiness increase when individuals are socially connected, and trustworthiness decreases when partners are of different races or nationalities. High-status individuals elicit more trustworthiness from others. The study integrates experiments with surveys to measure individual-level variation in trust and trustworthiness. They find that social connections, such as shared friends and longer acquaintance, predict trust and trustworthiness. Trustworthiness declines when partners are of different races or nationalities. Background characteristics, such as education and organization membership, predict trustworthiness. The study also finds that trust is influenced by social capital, with more educated individuals and members of volunteer organizations earning more in the experiment. The results suggest that trust and trustworthiness are influenced by social connections, race, nationality, and individual characteristics. The study highlights the importance of measuring trust and trustworthiness through experiments and surveys to understand their role in social capital.