Oil is above $100 a barrel. Here's what that means at the pump.

Top story

Oil prices swung on Monday. Brent crude, the global benchmark, fell more than $3 a barrel in the morning after the U.S. eased sanctions on Russia, which could put more Russian oil on the market. By the close it had won most of that back, ending at $109.55, down 0.3%. On Friday it hit its highest price in five months.

The bigger worry is the Strait of Hormuz, a narrow waterway between Iran and Oman that normally carries about a fifth of the world's oil. Attacks on ships there have cut how much oil gets through. Iran's Revolutionary Guards said a tanker caught fire after hitting a naval mine there on Sunday, and crude exports from the Persian Gulf fell to about 8.5 million barrels a day last week, down from more than 20 million the week before.

Why it matters to you: Gasoline is made from oil, so pump prices follow it. Regular gas averaged about $4.30 a gallon nationwide on Monday, according to AAA. If oil stays high, driving, flying and shipping almost anything gets more expensive.

Your money

What a 5% Treasury yield means for you

A Treasury is a loan you make to the U.S. government. The yield is the interest rate the government pays you for it. On Monday, the 10-year Treasury yield closed at 5.14%.

That one number ripples through the economy. Mortgage rates move closely with the 10-year yield, so buying a home costs more right now. Other loans, like car loans, tend to get pricier when rates are high too.

But it's good news for savers. When the government pays around 5% on a safe loan, banks have to offer competitive rates on things like CDs to keep your money. You can even buy Treasuries straight from the government at TreasuryDirect, with a parent's help if you're under 18.

Stock of the day

Amazon AMZN +5.0%

Amazon jumped 5% on Monday, the biggest gain among the big-name stocks we follow, after Morgan Stanley named it a top pick and raised its price target to $350 from $335. A price target is where an analyst thinks a stock will trade in about a year. Amazon reports its quarterly earnings on October 29.

Pop quiz

Class discussion

Besides filling up a car, what's something your family buys that could get more expensive if oil stays near $100? Why?

Last bell

A SpaceX share for every kid?

On Monday, Elon Musk posted that next year he'll give one of his own SpaceX shares to every kid in America. With about 72 million kids in the U.S. and SpaceX stock at about $146 a share, that adds up to roughly $10.5 billion. The details aren't clear yet, including who counts as a kid and how you'd actually get your share.

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