11+ hour, 48+ min ago   (221+ words) July 21, 2026 6:30am by Barry Ritholtz • Why Most Portfolios Are Under Diversified: QuantPedia’s data-driven case that even portfolios that look diversified aren’t — correlation spikes during stress, factor overlap, and the illusion of spreading risk. (QuantPedia) • The Rise and Fall of TikTok’s Real…...

3+ day, 18+ hour ago   (1507+ words) July 17, 2026 1:00pm by Barry Ritholtz Perhaps the question I hear asked most often is: “Are we in a bubble?” and “What’s happening with this artificial intelligence thingie?” I picked a few of my favorite charts that shed light on this issue....

4+ day, 23+ hour ago   (267+ words) July 16, 2026 12:00pm by Barry Ritholtz I have been busy on a few projects, most of which are wrapping up. Blogging has been light, but I have some fun things teed up in the near future. I wanted to come out of…...

6+ day, 5+ hour ago   (268+ words) July 15, 2026 6:30am by Barry Ritholtz My mid-week morning train WFH reads: • Developers Are In On The Joke: Apologize Later: Jonathan Miller on developers who build first and beg forgiveness after. The oldest play in real estate. NYC Development Legend Harry Macklowe’s…...

2+ week, 5+ day ago   (26+ words) The Big Picture It's here! Order now Quote of the Day How Greed and Easy Money Corrupted Wall Street and Shook the World Economy...

2+ week, 5+ day ago   (398+ words) July 2, 2026 6:30am by Barry Ritholtz My morning train WFH reads: • Will AI Make Companies Outsource More, or Less?: Noah Smith on how AI might redraw the boundaries of the firm — Coase for the model era. A genuinely interesting question most coverage…...

2+ week, 6+ day ago   (596+ words) July 1, 2026 11:00am by Barry Ritholtz Funny story: I was supposed to have Bobby Bonilla on for Masters in Business, but it did not come to pass.1 That was a shame, because it’s a fascinating cautionary tale about hubris, fraud, misunderstanding risk,…...

3+ week, 3+ day ago   (26+ words) The Big Picture It's here! Order now Quote of the Day How Greed and Easy Money Corrupted Wall Street and Shook the World Economy...

1+ mon, 1+ week ago   (1082+ words) June 15, 2026 8:30am by Barry Ritholtz Since it’s commencement time, I wanted to share a few thoughts on serendipity. I have been working in finance since 1996 — three decades. My views on nearly everything have evolved over that time: Indexing, crowd behavior, trading,…...

1+ mon, 6+ day ago   (319+ words) June 15, 2026 6:30am by Barry Ritholtz My back-to-work morning train WFH reads: • Bitcoin’s long-term return may actually be close to zero — and that could be just what it needs: MarketWatch runs the math on Bitcoin’s long-term expected return and lands somewhere near…...