John D. Rockefeller was America’s first billionaire, his fortune at its apex worth well over $300 billion in our terms. The son of a con man and a deeply devout mother, he was, quite appropriately, both very awful and very good, a merciless monopolist and a generous philanthropist. He donated hundreds of millions toward medical research and education, among other charities, and was known to hand out dimes–“Rockefeller dimes,” as they came to be called–to adults and children alike. The administering of those shiny ten-cent pieces–which were worth in 1928 roughly $1.40 by 2017 standards–was done both for propaganda purposes and because it amused the titan.
From the February 18, 1928 Brooklyn Daily Eagle: