The problem with Mr. Romney’s pitch is the kind of businessman he was: specifically, a buyer of flailing companies who squeezed out the inefficiencies (often known as employees) and then sold or merged them for a hefty profit. More than a fifth of them later went bankrupt, The Wall Street Journal reported on Monday. This kind of leveraged capitalism, which first caught fire in the 1980s, is one of the reasons for the growth in the income gap, tipping the wealth in the economy toward the people at the top.