What goes up can also come down? Tech stocks rise looked unstoppable, but lately they've

taken a tumble.

Watching investors make of the market's jitters.

You're listening to Money Talks on Economist Radio, our weekly podcast on the markets, the economy, and the world of business.

I'm Patrick Lane, Deputy Digital Editor at The Economist.

And coming up on today's show, Reed Hastings, co-founder and co-c CEO of Netflix on how to make TV by algorithm pay.

We want to produce content that you, our members, want to watch, and so we measure it is how much

watching does it get compared to how much it costs and more countries and businesses

say they want to reach net zero carbon emissions, but is that just a lot of hot air?

The idea that if you unilaterally reduce your carbon production,

that you'll then stop contributing to climate change.

But that's just wrong unless you're going to stop trading. The rise and rise of American stock markets has faltered. The technology heavy

NASDAQ index fell by more than 3% on Tuesday's opening, and that came after consecutive falls

on Thursday and Friday for the tech stocks that drove a record-breaking summer.

Investors who had hoped that the long Labor Day weekend would calm fears about further falls

will still be feeling anxious.

So last week the S&P 500 was down 2.3%, the NASDAQ was down 3.3% led by all of the big tech stocks, so Tesla, Amazon, Google, Microsoft, Facebook.

Alice Fullwood is the economist's Wall Street correspondent.

And that has continued this morning.

The Nasak opened down more than 3%, led by all those big tech

names which were largely down more than 5%, and in particular Tesla, which was down almost 20% when it opened this morning.

At the end of last week Alice there were reports that part of the explanation both for the

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