There is a new most expensive drug in the world. Price tag: $4.25 million

There is a new most expensive drug ever—a gene therapy that costs as much as a Brooklyn brownstone or a Miami mansion, and more than the average person will earn in a lifetime. Lenmeldy is a gene treatment for metachromatic leukodystrophy (MLD) and was approved in the U.S. on Monday. Its maker, Orchard Therapeutics, said…