3 of 6
The Global Web Empire Builder
The Global Web Empire Builder
Marcos Galperin, 39, founder and CEO, MercadoLibre

The online marketplace Galperin started 11 years ago is now the leading retail platform in 12 countries in Latin America, with 43 million users -- and eBay as an 18% owner.

In his own words: "We constantly are sacrificing short-term revenue ideas to build a large, lasting business."

NEXT: The Trader
Last updated October 14 2010: 6:16 AM ET
Full List: Top 40 Meet this year's class of youthful movers and shakers. They're innovating, they're expanding, and they're not really thinking about the recession. More
Where is the economy heading? This year's innovators offer their economic predictions for the next few years and beyond. More
Highest paid under 40 Which young executives at public companies brought home the most bacon this year? And exactly how much bacon are we talking about? More