Andrew Ross Sorkin had an interesting column in the New York Times yesterday — a business and economic take on how to make mass shootings less common. PayPal and Square, Sorkin pointed out, decided years ago not to let people use their services to buy guns. What about Mastercard and Visa, he wondered. Or the big banks that issue credit cards? Why can’t — or won’t — they do the same?

Click the audio player above to hear the full story.