Super Tuesday has arrived, with voters from 15 states heading to the polls to cast their ballots in the presidential primaries. As it appears increasingly likely that the general election will once again feature a contest between former President Donald Trump and incumbent President Joe Biden, Yahoo Finance's Senior Columnist Rick Newman breaks down the potential implications for stock markets and investors.

Newman notes individual differences between a Trump and Biden presidency, such as the impact on trade agendas and individual and corporate tax cuts,

For more expert insight and the latest market action, click here to watch this full episode of Yahoo Finance Live.

Editor's note: This article was written by Angel Smith

Video Transcript

SEANA SMITH: Well, the biggest primary day of the year, Super Tuesday kicking off today. Voters in 15 states and one territory will be heading to the polls to vote in presidential primaries. It's bringing Yahoo Finance's Rick Newman to discuss what this means for the market. Rick, how should investors-- should investors be making any adjustments to their portfolios at this time?

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RICK NEWMAN: Making no investment-- no changes to their investments at this time, but paying attention because what's going to happen with Super Tuesday is we're basically just going to jump from the primary elections to the general election, barring any major surprises. And the only possible surprise is that Donald Trump does not end up as the de facto nominee on the Republican side after today.

He will probably win-- he won't get enough to actually have the delegates he needs to clinch the nomination, but he's going to be so far ahead that many analysts think the only other challenger on the Republican side, Nikki Haley, will basically drop out within the next few days, assuming this goes as planned. And then we have Biden versus Trump. And we're just going to get to the general election sooner than we do in some election years.

And, I think, this is going to start to matter for markets as we get into late summer and fall, which is when-- I mean, look, everybody's focused on, what is the Fed going to do, our stocks overbought, are they overvalued, and so on. But as we get within two, three months of the election in November, investors are really going to have to start focusing on major differences between Trump and Biden.

This involves what's going to happen to individual tax cuts that expire at the end of 25, what about the corporate tax rate, what about Trump's trade agenda. He wants to impose more tariffs on imports. So for sure, investors are going to be paying attention to this as we get closer to the election. And we're going to get to an important step probably this week, which is that we get beyond the primaries into the general election.