Macro Hive Conversations With Bilal Hafeez Ep. 335: Marc Rubinstein on AI Bubble, Private Credit, Jane Street Rise
21 snips
Nov 20, 2025 
Join Marc Rubinstein, an expert in financial services and author of the Net Interest newsletter, as he dives into the turbulent world of finance. He draws fascinating parallels between the current AI boom and historical bubbles. Rubinstein also highlights the risks tied to private credit growth and discusses how Jane Street leverages technology for trading success. Explore the challenges fintech faces and how AI may disrupt entry-level jobs in finance. His insights are informed by years in hedge funds and a deep understanding of market history.
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Treat Rapid Credit Growth As A Warning
- Monitor super-normal lending growth as an early warning sign for credit risk.
- Watch underwriting standards, opacity, and leverage in private credit to gauge vulnerability.
Collateral Inspections And The Salad Oil Swindle
- During First Brands' bankruptcy lenders physically inspected warehouses and produced photographic evidence of collateral.
- Rubinstein compares this to the historic 'Great Salad Oil Swindle' where inspectors were deceived by fraudulent collateral.
Tech And Regulation Drive Principal Trading Edge
- Firms like Jane Street and XTX capture huge trading revenue using technology and fewer people.
- Regulation also matters: principal trading firms face different constraints than banks, amplifying their advantage.
