Millennials, baby boomers to help U.S. achieve its greatest economic expansion in history, Wall Street veteran Ed Yardeni predicts

Wall Street veteran Edward Yardeni sees two key demographics giving stocks a boost now through at least next year: Millennials and baby boomers.

According to Yardeni, it comes down to their spending habits.

"They [Baby Boomers] are increasingly becoming minimalists. They are trading down in terms of houses that they want to live in," the Yardeni Research founder told CNBC's "Trading Nation" on Friday.

"At the same time, we've got millennials who are also minimalists," he added. "Many prefer to rent and stay in the City, and not buy houses, and not even buy cars."

Less spending may seem counterintuitive, since spending accounts for around 2/3 of U.S. economic activity. However, Yardeni contended it's bullish, because it helps prevent the U.S. economy from overheating.

"Put it all together and you've got an economy that continues to grow led by consumer spending, but not in a fashion that suggests that a boom is going to lead to inflation, and a Fed reaction that leads to a bust," he said. "So, all in all, I put it together as still a very favorable environment for stocks."

His thoughts came as the S&P 500 Index was logging its worst day of August. The drop came amid President Donald Trump's decision to double the size of metal tariffs on Turkey, which created a currency crash there.

Still, Yardeni isn't letting the latest geopolitical developments affect his bullish case.

"This all creates a lot of commotion on a global basis. It kind of makes the U.S. look like an island of serenity, all things considered. I think this really favors investing in the U.S. as opposed to investing on a global basis," he said.

Yardeni has been one of the street's most consistent bulls — turning positive a few days after the S&P 500 hit an intraday low of 666 on March 6, 2009. He sees no reason to start getting bearish now: Yardeni is maintaining his year-end price target of 3100, a 9 percent gain from current levels.

"The earnings picture really has been phenomenally strong. I've been bullish on earnings, and it's coming in even stronger than I expected," he noted.

And, if the economy continues to grow, next July will mark the country's longest expansion in history — a milestone he believes is within reach.

"What the stock market cares about most is the business cycle," Yardeni said. "As long as investors perceive that the U.S. economy can continue to grow without a risk of recession, you get a bull market.

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Trading Nation is a multimedia financial news program that shows investors and traders how to use the news of the day to their advantage. This is where experts from across the financial world – including macro strategists, technical analysts, stock-pickers, and traders who specialize in options, currencies, and fixed income – come together to find the best ways to capitalize on recent developments in the market. Trading Nation: Where headlines become opportunities.

Michael Santoli

Michael Santoli joined CNBC in October 2015 as a Senior Markets Commentator, based at the network's Global Headquarters in Englewood Cliffs, N.J.  Santoli brings his extensive markets expertise to CNBC's Business Day programming, with a regular appearance on CNBC's “Closing Bell (M-F, 3PM-5PM ET).   In addition, he contributes to CNBCand CNBC PRO, writing regular articles and creating original digital videos.

Previously, Santoli was a Senior Columnist at Yahoo Finance, where he wrote analysis and commentary on the stock market, corporate news and the economy. He also appeared on Yahoo Finance video programs, where he offered insights on the most important business stories of the day, and was a regular contributor to CNBC and other networks.

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