A new book, "The Everywhere Millionaire," explores the wealth accumulated by successful small business owners.
Biodiesel is having a moment. The Trump administration is mandating 60% more domestic production in the next few years.
So-called “Main Street Millionaires” — as they’ve been dubbed in a new book by economists Owen Zidar and Eric Zwick — have more than 13 times the wealth of the Forbes 400. So who are they?