California has around half of the nation’s unsheltered homeless population. The state’s homelessness crisis has become a talking point for Republicans and a warning sign for Democrats in blue cities and states across the country. Last month, the Benioff Homelessness and Housing Initiative at the University of California, San Francisco, released a landmark report about homelessness in the state, drawing from nearly 3,200 questionnaires and 365 in-depth interviews. It is the single deepest study on homelessness in America in decades. And the report is packed with findings that shed new light not only on California’s homelessness problem but also on housing affordability nationwide. Jerusalem Demsas is a staff writer at The Atlantic who has written extensively about the interlocking problems of housing affordability and homelessness in America. So I asked her on the show to walk me through the core findings of the study, what we know about the causes of homelessness, and what solutions exist to address it. We discuss the surprising process by which people end up homeless in the first place, the “scarring” effect that homelessness can have on their future prospects, the importance of thinking of homelessness as a “flow,” not a “stock,” the benefits and limitations of “housing first” approaches to end homelessness, why Republican proposals for being tougher on the homeless can make the problem worse, why neither generous social safety nets nor private equity firms are to blame for homelessness, and more. Book Recommendations: Homelessness Is a Housing Problem by Gregg Colburn and Clayton Page Aldern Children of Time by Adrian Tchaikovsky Strangers to Ourselves by Rachel Aviv Listen to this podcast in New York Times Audio, our new iOS app for news subscribers. Download now at nytimes.com/audioapp Thoughts? Guest suggestions? Email us at [email protected]. You can find transcripts (posted midday) and more episodes of “The Ezra Klein Show” at nytimes.com/ezra-klein-podcast, and you can find Ezra on Twitter @ezraklein. Book recommendations from all our guests are listed at https://www.nytimes.com/article/ezra-klein-show-book-recs. This episode of “The Ezra Klein Show” was produced by Rollin Hu. Fact-checking by Michelle Harris, with Mary Marge Locker. The senior engineer is Jeff Geld. The senior editor is Rogé Karma. The show’s production team also includes Emefa Agawu, Annie Galvin and Kristin Lin. Original music by Isaac Jones. Audience strategy by Kristina Samulewski and Shannon Busta. The executive producer of New York Times Opinion Audio is Annie-Rose Strasser. Special thanks to Sonia Herrero.