The Tycoons: How Andrew Carnegie, John D. Rockefeller, Jay Gould, and J. P. Morgan Invented the American SupereconomyMakes a reader feel like a time traveler plopped down among men who were by turns vicious and visionary.The Christian Science Monitor The modern American economy was the creation of four men: Andrew Carnegie, John D. Rockefeller, Jay Gould, and J. P. Morgan. They were the giants of the Gilded Age, a moment of riotous growth that established America as the richest, most inventive, and most productive country on the planet. Acclaimed author Charles R.