From a new generation of billionaires.. to a hopeful outlook for the world economy. Here is the Week in Numbers. First up...

6% is the International Monetary Fund's new outlook for global growth this year. And that would be a rate unseen since the 1970s.

"What we are seeing is multi-speed recoveries around the world."

Fund chief economist Gita Gopinath says the sunnier outlook reflects brightening prospects for the U.S. after Washington enacted $1.9 trillion in relief spending.

4,097 points marked another record closing high for the S&P 500 Index on Thursday, with tech stocks driving the gains. Investors got a mood boost after the U.S. Federal Reserve vowed to keep supporting the economy.

Nearly 1.3 million fewer cars could be made in the U.S. this year, according to an industry body. It's nothing to do with the global health crisis, though. It's a worldwide shortage of silicon chips that's biting hard instead. Friday saw Hyundai become the latest big name to cut output as supplies run short. Phonemakers and other gadget brands are snapping up the available chips first.

$4.7 billion is the cost to Credit Suisse from the collapse of Archegos Capital. The Swiss bank was slower than some U.S. rivals to dump stocks connected to the investment fund, and is literally paying the price. At least two top executives are losing their jobs as a result.

And 2,755 is how many billionaires there are in the world, according to Forbes Magazine at least.

Amazon boss Jeff Bezos tops the list for a fourth year, just edging out Tesla chief Elon Musk.

The chart features 493 new entries, and Kim Kardashian West is one of them. A lucrative cosmetics business sees her sneak in near the bottom of the list, with an estimated worth of just the one billion dollars.