Economists are going to have to approach things a bit differently if they want to stay relevant in the Trump age. Political economy research is going to become more important. Some humility wouldn’t hurt. And they should look someplace other than the federal government to test their ideas. This is what I took away from this past weekend’s American …

  The sun’s energy is free, but the capital required to harness it must earn a fair return. Try telling that to the gung-ho bidders for India’s utility-scale solar power projects. Auction prices will fall below 4 rupees (6 U.S. cents) per kilowatt-hour this year, Bloomberg News reports. The record low 2016 bid was 4.34 rupees. A 60 percent drop …

  There is no federal law against mentally unstable adults possessing a firearm in the US Psychotic episodes, recurring delusions, illnesses such as paranoid schizophrenia or dementia: None of these disqualify Americans from buying or owning guns. Only someone who has been officially declared “mentally defective,” or who has been involuntarily committed to a mental institution, is prohibited. That helps …