Five big trends and the ETFs that track them

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A customer pulls her shopping cart past an information kiosk at a Walmart store in Levittown, N.Y. Kiosks and signs throughout the store keep customers informed that they are shopping in an artificial-intelligence-driven environment.

Mark Lennihan/The Associated Press

Exchange-traded funds (ETFs) have evolved significantly from investments that track broad indexes to a plethora of theme-based plays such as clean energy, currency hedging and social media.

ETF providers regularly introduce products that reflect market trends, such as the cannabis ETFs launched in the run-up to Canada’s legalization of recreational marijuana, or the new gender-diversity products focused on companies that show a commitment to putting women on their boards and in top leadership positions. Investors are also looking for longer-term

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