If entrepreneur Mark Douglas could give his younger self one piece of advice, it would be to start investing sooner.
"Everyone always wishes they had started saving and investing earlier," says the founder and CEO of marketing and advertising company SteelHouse. After all, investing can be a simple way to double your money over time — and the sooner you start, the better off you'll be, thanks to the power of compound interest.
That's why Douglas started offering his employees $500 to invest in Acorns, an app that makes it easy for anyone to put their money to work.
"We have a lot of people in the company in their early 20's," the CEO tells CNBC. "I want to do for them what I wish someone had done for me when I was 23."