Anna Helhoski

But the economist I spoke with said that the flow of shipping through the strait is unlikely to immediately return to business as usual whenever it opens more permanently.

And gas prices won't necessarily drop.

Iran still has leverage to influence how much oil flows through the strait, which would keep global and domestic fuel oil elevated.

The U.S.

may produce its own oil, but it's not immune to global oil market volatility and price shocks.

So really, the big takeaway here is that gas prices are probably just the beginning.

Thanks, Elizabeth and Sean.

For a long time, buying an index fund was the standard advice for the average person who wasn't day trading and wanted their money to grow without having to think about it very much.

But index funds aren't as spread out as they once were.

And that's because a small group of companies now make up the biggest slice in the market.

And that means your investments are a little bit more concentrated than you might expect.

So today, Ryan Sterling, a wealth advisor with NerdWallet Wealth Partners, is joining me to talk about concentration risk, what it means for your money, and if there's anything you can really do about it.

Ryan, welcome to Smart Money.

So from my understanding, concentration risk is when a handful of companies are basically running the stock market.

Is that an oversimplification?

Got it.

So you mentioned looking back a little bit into history.

So has the market ever been quite this top heavy before?

So if a few companies are dominating the index, do market swings end up feeling bigger than they actually are?

In a highly concentrated market like we have right now, are investors more vulnerable to market swings?