# The Diversification Illusion and Market Insights Why portfolio diversification fails during market stress periods - **Source:** [The Big Picture](https://ritholtz.com) - **Published:** 2026-07-21 - **Topic:** [Finance](https://brifing.si/c/finance) - **Original article:** - **On Brifing:** https://brifing.si/s/fe5afdb2-9b38-4c00-ac11-97d77a6e494f ## The Diversification Mirage QuantPedia's data reveals how portfolios exhibit high correlation during stress tests. Even investments spread across asset classes remain vulnerable to systemic risks, exposing the limitations of traditional diversification strategies. ## Software Stock Opportunities Barron's explores how AI is eroding software companies' profit margins, yet some firms are adapting to create new opportunities. Investors may find potential in undervalued stocks navigating this transformation. ## Big Food's Dilemma The Wall Street Journal analyzes how companies like General Mills face squeezed profitability due to inflation and GLP-1 drugs. Shrinkflation strategies and price hikes meet consumer resistance, threatening industry models. ## Nuclear Renaissance Canary Media examines nuclear energy's potential expansion in the climate change era. The technology's role in global energy transition is being redefined by clean energy targets. ## Autonomous Vehicles' Unknowns Wired investigates how Waymo's AI systems 'think' in traffic and make decisions in edge cases. The technology's capabilities and limitations raise new questions about human-machine interaction. ## New Forms of Value Kevin Kelly's seminal essay revisits how uncopyable values (personalization, access, interpretation) gain prominence in the digital age. Business models now compete on delivering rare and authentic experiences. ## Sources covering this story - https://ritholtz.com/2026/07/10-tuesday-am-reads-482/ — --- _Summary written by Brifing from the original reporting. Copyright in the original article belongs to its publisher; read the full piece at the link above._