Michael Suh, a 25-year-old New Jerseyan, has bought everything from blue-chip stocks to mutual funds through brokers who work for banks. And when the market took a dive Monday, Mr. Suh held tight.

"I'm not really worried about it," Mr. Suh observed. "I'm looking for a long-term strategy."

Limited Time Offer

Save $400 off your subscription. Special offer ends April 30, 2017.

14-Day Free Trial

No credit card required. Complete access to articles, breaking news and industry data.