Marc Lore is taking on Amazon with Jet.com, a subscription-based discount shopping site. (Imagine if Costco and Amazon had a baby.) Jet.com raised $225 million before it even launched in July.
Lore, 44, is no stranger to Amazon. He sold his company Quidsi -- the parent of Diapers.com and Soap.com -- to the e-commerce giant for $540 million in 2011.
What I would tell my 18-year-old self:
"I would tell myself to stop always thinking about the next step or the next big thing and to just focus on enjoying the moment."