The key to building wealth? Start slowly

What's the best way for young investors to build wealth for retirement? Ignore your human instincts, says a new e-book targeted at 20- and 30-somethings.

"If You Can: How Millennials Can Get Rich Slowly," was written by William Bernstein, a retired neurologist, who has authored several books about investing. Although Bernstein manages investments for high-net-worth individuals, he decided to write a book for young investors because he is concerned about their financial future.