Carlos Slim Helú Facts

$35 billion

Telecom/Mexico
69. Widowed, six children

Economic downturn and plunging peso shaved $25 billion from the fortune of Latin America's richest man. Global recession testing his ability to live up to the principles he sets for his employees: "Maintain austerity in times of fat cows." Son of a Lebanese immigrant bought fixed-line operator Telefonos de Mexico (Telmex) in 1990; now controls 90% of Mexico's telephone landlines. Would be a billionaire based on his dividends alone. Biggest holding: $16 billion stake in America Movil, Latin America's largest mobile phone company, with 173 million customers. America Movil and Telmex reportedly planning to jointly invest $4 billion to bolster telecom infrastructure in Latin America. Buying up cheap media, energy and retail assets. Last year took stakes in New York Times Co., former billionaire Anthony O'Reilly's Independent News & Media and Bronco Drilling; also increased position in Saks. Baseball statistics aficionado, art collector.

Theo Albrecht

$18.8 billion
Supermarkets/Germany
87. Married, two children

Runs discount supermarket group Aldi Nord; firm holding up amid economic downturn. Sales expected to hit $31 billion in 2008. After World War II he and older brother Karl transformed their mother's corner grocery into Aldi. Brothers split ownership in 1961; Karl took the stores in southern Germany, plus the rights to the brand in the U.K., Australia and the U.S. Theo got the northern Germany stores and the rest of Europe. Unable to operate Aldi stores in U.S., Theo developed discount food store Trader Joe's; now has more than 320 U.S. stores. Also owns stake in Supervalu. Became a recluse after being kidnapped for 17 days in 1971; said to collect old typewriters, loves golf

Warren Buffett Facts

$37 billion
Investments/U.S.
78. Widowed, remarried; three children

Last year America's most beloved investor was the world's richest man. This year he has to settle for second place after losing $25 billion in 12 months. Shares of Berkshire Hathaway down 45% since last March. Injected billions of dollars into Goldman Sachs, General Electric in exchange for preferred stock last fall; propped up insurance firm Swiss Re in February with $2.6 billion infusion. Admits he made some "dumb" investment mistakes in 2008. Upbeat about America's future: "Our economic system has worked extraordinarily well over time. It has unleashed human potential as no other system has, and it will continue to do so." Scoffs at Wall Street's over-reliance on "history-based" models: "If merely looking up past financial data would tell you what the future holds, the Forbes 400 would consist of librarians." Son of Nebraska politician delivered newspapers as a boy. Filed first tax return at age 13, claiming $35 deduction for bicycle. Studied under value investing guru Benjamin Graham at Columbia. Took over textile firm Berkshire Hathaway 1965. Today holding company invested in insurance (GEICO, General Re), jewelry (Borsheim's), utilities (MidAmerican Energy), food (Dairy Queen, See's Candies). Also has noncontrolling stakes in Anheuser-Busch, Coca-Cola, Wells Fargo

Information about Karl Albrecht

$21.5 billion
Supermarkets/Germany
89. Married, two children

Germany's richest person owns discount supermarket giant Aldi Sud. Retailer faring well amid economic downturn; analysts expect its 2008 sales to be up 9.4% to $33.7 billion. Sales in the U.S. up estimated 20% last year to $7 billion. Plans to open 75 U.S. stores in 2009, including first in New York City. With younger brother, Theo, transformed their mother's corner grocery store into Aldi after World War II. Brothers split ownership in 1961; Karl took the 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. Retired from daily operations. Fiercely private: little known about him other than that he apparently raises orchids and plays golf.