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Finance sites erroneously show Amazon, Apple, other stocks crashing

marketwatch.com

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Re: Finance sites erroneously show Amazon, Apple, other stocks crashing

#71

Post by cm2187 »

trothamel wrote: post #38

One nice thing about SEC-regulated markets - unlike the various cryptocurrency markets - is that it's possible for trades to be rolled back if they are "clearly erroneous". That isn't perfect - if the data is only a little off, it might not be possible to get a trade rolled back - but it tends to limit how much havoc is called. https://www.sec.gov/news/press/2009/2009-215.htm (My understanding is that trades can also…

Not second order effects. Like if I have a stock affected in my portfolio, my broker may close a position to reduce my leverage or execute a stop loss order. They can't sell that stock because the US is closed, so they will sell the other positions outside of the US, which are unaffected by this bug.

These transactions have been induced by an error but are not clearly erroneous and will not be cancelled.

It happened in 2014 when the NYSE did a similar fuckup. Their reaction was "who cares, US markets are closed". There was a lot of livid comments from canadian investors on forums.

Re: Finance sites erroneously show Amazon, Apple, other stocks crashing

#72

Post by notahacker »

Nition wrote: post #24
jfoutz wrote: post #19

Earlier quoted context omitted.

But they are still on the road. They're still a hazard to everyone around them. Pedestrians, cyclists, and other drivers are all at risk.

Yes but they'll continue to be on the road until they can get in a self-driving car that they can trust.

Never mind trust: teens and seniors generally don't have the disposable income to spend on high end brand new cars (or expensive retrofits of sensor devices). The first buyers, apart from the wealthy, would be people and corporations that spend the most time on the road: generally tending towards being better than average drivers.

And even if self-driving cars were exactly as good as the drivers they replaced, half the purpose of buying them is to spend more time on the road...

Re: Finance sites erroneously show Amazon, Apple, other stocks crashing

#73

Post by oelmekki »

grondilu wrote: post #5

Sometimes I wonder if it would make sense to place long-term buy orders at a ridiculously low bids. Just in case.

That would mean locking in the amount you dedicated with very extremely low (lottery level) chance of any return. Most probably, you would not see that money ever again (provided you don't decide to remove your bid, obviously). Better give it to a charity :)

Re: Finance sites erroneously show Amazon, Apple, other stocks crashing

#74

Post by jstanley »

valarauca1 wrote: post #54
bendbro wrote: post #52

Earlier quoted context omitted.

Why can't majority participants in a crypto currency agree to roll back?

The majority of participants do not in a crypto-currency. Only the majority of the hashing power.

If a majority of participants rejected blocks that were on a chain that did not rollback the erroneous transaction, then the hash power would be forced to follow.

I believe the term for who decides is the "economic majority".

Re: Finance sites erroneously show Amazon, Apple, other stocks crashing

#75

Post by cm2187 »

bbgm wrote: post #63

As some have suggested, Nasdaq is confirming that this was test data that got propagated to third party aggregators. https://mobile.twitter.com/Nasdaq/status/882054148413325313 http://www.nasdaqtrader.com/TraderNews.aspx?id=utp2017-05

Using production systems to run tests... What could go wrong?

Re: Finance sites erroneously show Amazon, Apple, other stocks crashing

#78

Post by nickpeterson »

cm2187 wrote: post #75
bbgm wrote: post #63

As some have suggested, Nasdaq is confirming that this was test data that got propagated to third party aggregators. https://mobile.twitter.com/Nasdaq/status/882054148413325313 http://www.nasdaqtrader.com/TraderNews.aspx?id=utp2017-05

Using production systems to run tests... What could go wrong?

No test like production.

Re: Finance sites erroneously show Amazon, Apple, other stocks crashing

#79

Post by humanrebar »

cm2187 wrote: post #75
bbgm wrote: post #63

As some have suggested, Nasdaq is confirming that this was test data that got propagated to third party aggregators. https://mobile.twitter.com/Nasdaq/status/882054148413325313 http://www.nasdaqtrader.com/TraderNews.aspx?id=utp2017-05

Using production systems to run tests... What could go wrong?

It's actually considered best practice in various categories of technology to run tests on the production systems.

https://en.wikipedia.org/wiki/Built-in_self-test

Re: Finance sites erroneously show Amazon, Apple, other stocks crashing

#80

Post by noir_lord »

humanrebar wrote: post #79
cm2187 wrote: post #75

Earlier quoted context omitted.

Using production systems to run tests... What could go wrong?

It's actually considered best practice in various categories of technology to run tests on the production systems. https://en.wikipedia.org/wiki/Built-in_self-test

When done intentionally.

I've seen lots of tests 'escape' their environment for a bunch of reasons (tests got sent to production with a deploy, human was on the wrong machine and ran a manual test command etc etc).

It's almost impossible not to screw up at some point, I try to focus on minimising the small mistakes (airline pilots have commented that it's not the first problem that kills you it's the second one).

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