Net Worth: $25.4 billion DOWN
His $39 billion (estimated sales) discount supermarket giant, Aldi Sud, has some 4,500 stores, including 1,200 across 32 U.S. states. It opened its first New York City locations in 2011, one in Queens and another in the Bronx. To keep costs low, Aldi stores do not accept credit cards. He and his late brother Theo built their mother's corner grocery store into Aldi after World War II. They split ownership in 1961; Karl took the more profitable stores in southern Germany, plus the rights to the brand in the U.K., Australia and the U.S. Theo got northern Germany and the rest of Europe.
(AP Photo/Joerg Sarbach) More From Forbes: The World’s Billionaire Women The World’s Billionaire Newcomers The World’s Youngest Billionaires The World’s Billionaire Dropoffs The opinions expressed are solely those of the author and do not necessarily reflect the views of Comcast.