Bill Gates Richest In U.S. - Business Insider

Gatesの資産が増えたのはMSからではなくて、以下のような投資している企業の資産価値の増からだそうです。
His investment firm Cascade owns a big chunk of tractor maker Deere & Co., as well as Canadian National Railway and Mexican Coke bottler Femsa.

Bill Gates Richest In U.S. - Business Insider: