A look at progress in generative AI shows that OpenAI’s latest, greatest model sits on a neat curve of growing utility over time. But what other firms are on that curve, and where is it taking humanity? After a long, wary time, Japanese savers are getting into investing—with gusto. And what goofy, small-time wrestling leagues reveal about today’s America.Get a world of insights by subscribing to Economist Podcasts+. For more information about how to access Economist Podcasts+, please visit our FAQs page or watch our video explaining how to link your account.