In 2014, the economists Owen Zidar and Eric Zwick were asked by the Treasury to conduct a study on the tax burden of private business owners. It was tricky to figure out how much these sorts of business owners — auto dealers, contractors, the like — actually owed in taxes: After Reagan's 1986 tax reforms, pass-through businesses and other accounting tricks became widespread enough to obscure this class of wealthy Americans hiding in plain sight. The research they conducted led to their new book