Google and Facebook are worth a combined $2 trillion, with the vast majority of their revenue coming from advertising. In our previous episode, we learned that TV advertising is much less effective than the industry says. Is digital any better? Some say yes, some say no — and some say we’re in a full-blown digital-ad bubble.

Companies around the world spend more than half-a-trillion dollars each year on ads. The ad industry swears by its efficacy — but a massive new study tells a different story.

The modern world overwhelms us with sounds we didn’t ask for, like car alarms and cell-phone “halfalogues.” What does all this noise cost us in terms of productivity, health, and basic sanity?

John Mackey, the C.E.O. of Whole Foods, has learned the perils of speaking his mind. But he still says what he thinks about everything from “conscious leadership” to the behavioral roots of the obesity epidemic. He also argues for a style of capitalism and politics that at this moment seems like a fantasy. What does he know that we don’t?

The sociologist Sudhir Venkatesh spent years studying crack dealers, sex workers, and the offspring of billionaires. Then he wandered into an even stranger world: social media. He spent the past five years at Facebook and Twitter. Now that he’s back in the real world, he’s here to tell us how the digital universe really works. In this pilot episode of a new podcast, Venkatesh interviews the progressive political operative Tara McGowan about her digital successes with the Obama campaign, her noisy failure with the Iowa caucus app, and why the best way for Democrats to win more elections was to copy the Republicans.

A fine reading of most policies for “business interruption” reveals that viral outbreaks aren’t covered. Some legislators are demanding that insurance firms pay up anyway. Is it time to rethink insurance entirely?

As beloved and familiar as they are, we rarely stop to consider life from the dog’s point of view. That stops now. In this latest installment of the Freakonomics Radio Book Club, we discuss Inside of a Dog with the cognitive scientist (and dog devotee) Alexandra Horowitz.

It isn’t just supply and demand. We look at the complicated history and skewed incentives that make “affordable housing” more punch line than reality in cities from New York and San Francisco to Flint, Michigan (!).

The pandemic has hit America’s biggest city particularly hard. Amidst a deep fiscal hole, rising homicides, and a flight to the suburbs, some people think the city is heading back to the bad old 1970s. We look at the history — and the data — to see why that’s probably not the case.

It was only in his late twenties that America’s favorite brainiac began to seriously embrace his love of trivia. Now he holds the “Greatest of All Time” title on Jeopardy! Steve Levitt digs into how he trained for the show, what it means to have a “geographic memory,” and why we lie to our children.