For economics and economy-related cultural topics, I really like NPR's Planet Money (https://www.npr.org/sections/money/127413729/planet-money/). The episodes on average are really short (anything from 6 to 20 minutes) so they're great for a quick passtime.
The polar opposite would be Dan Carlin's Hardcore History, with each episode seldom less than four hours. But with a fantastic narration and historical research that's head and shoulders beyond any other podcast I've ever seen (https://www.dancarlin.com/hardcore-history-series/)
Mike Rowe's podcast is another one that's great for when you need just to plug in a few minutes gap of free time with just general amusement and stories (http://mikerowe.com/podcast/)
A subject of interest to me personally is true crime and criminal justice, and there are plenty of quality podcasts on the subject. Two of the best out there are Sword and Scale (http://swordandscale.com/), and Criminal (http://www.thisiscriminal.com).