Gadi Barlevy, Ines XavierWe develop a model of Ponzi schemes with asymmetric information to study Ponzi frauds. A long-lived agent offers to save on behalf of short-lived agents at a higher rate than they can earn themselves. The long-lived agent may genuinely have a superior savings technology, but may be an imposter trying to steal from short-lived agents. The model identifies when a Ponzi fraud can occur and what interventions can prevent it.

Mae Reeves and her husband, Joel, pose with her hats at Mae's Millinery in Philadelphia, circa 1953.

Do sovereign credit ratings take into account physical and transition climate risks? This paper empirically addresses this question using a panel dataset that includes a large sample of countries over two decades. The analysis reveals that higher temperature anomalies and more frequent natural disasters—key indicators of physical risk—are associated with lower credit ratings. In contrast, transition risk factors do not appear to be systematically integrated into credit ratings throughout the entire sample period.

Sara Wynn-Williams, defying Facebook’s attempts to silence her, reveals the company’s toxic culture and global damage, exposing unethical practices and a profit-at-any-cost approach. The key question she leaves us with: How can this be changed?
Early in her chilling account of life as a Facebook executive, Sara Wynn-Williams drops an intriguing detail: Mark Zuckerberg’s favorite president. The young founder – still in his twenties at the time -- picks Andrew Jackson, because he “got stuff done.”