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Trading halted as U.S. stocks plummet

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Re: Trading halted as U.S. stocks plummet

#721
post #60

Trump created a situation that's shaky as hell. I'm glad something happened that makes him suffer at least some consequences for once. Too bad it had to be this bad an event.

Please don't take HN threads into partisan flamewar.

We detached this subthread from https://news.ycombinator.com/item?id=22525433.

Re: Trading halted as U.S. stocks plummet

#722

Earlier quoted context omitted.

It is, there was this HFT firm I interned at once that rebooted all their servers at the end of the trading day to make sure they would start clean and fast the next day.

It also ensures you can come back up after an unexpected shutdown.

This is the best reason. Knowing your business systems will simply come back with the power, and having that tested on a daily basis will quickly put everyone at ease.

Re: Trading halted as U.S. stocks plummet

#723

Earlier quoted context omitted.

> As a retail investor (i.e. not extremely rich), you can't gain any advantage over the market that overcomes your transaction costs. Sure you can. You develop a system, learn how to find information, and make good predictions of future human behavior. You should learn the ins and outs of the product you're trading.

The efficient market hypothesis would like a word with you.

That's the price at a instantaneous moment in time. Trading requires that price to move, which it does as new information constantly arrives.

You can interpret that data differently, find your own data, and make your own predictions on future data.

Re: Trading halted as U.S. stocks plummet

#724

Earlier quoted context omitted.

The efficient market hypothesis would like a word with you.

Out of the all the casualties of the virus, the efficient market hypothesis has got to be one of them... Where were efficient markets when all news from China pointed to a pandemic?

The human lifespan is too short to distinguish between luck and skill for most low frequency traders. You'd have to see dozens of potential pandemics as severe as this one to know if you were "right". But it's empirically true that the average active trader underperforms the market. I build short-term trading strategies at my day job, but at home I just buy and hold some boring vanilla index funds. One nice thing about higher-frequency trading is that you have enough statistical power to quickly see lots of "obvious" ideas fail miserably. It teaches humility.

Re: Trading halted as U.S. stocks plummet

#725
post #625

I notice that there are many commenters here offering opinions on the future price of equities. Note that nobody has any idea where equity prices will be in one day, never mind one year or ten years' time. As a retail investor (i.e. not extremely rich), you can't gain any advantage over the market that overcomes your transaction costs. So relax. There's nothing to do here. If you're contributing to a retirement fund,…

Most people don't seem to understand that you don't pull all your retirement out at once, so the market going up or down doesn't really affect that

But it is wonderful for headlines:

"The man who retired on the week the DOW plunged" https://www.barrons.com/articles/he-retired-the-week-the-dow...

Re: Trading halted as U.S. stocks plummet

#726

Earlier quoted context omitted.

The efficient market hypothesis is that markets are efficient to present public information. If markets were efficient to the present value of the future price at all times, then there would be no such thing as insider trading and hedge funds would all lose money. You can make money by making inferences about present facts, or taking views on future occurrences.

I'm not clear why you mention insider trading here? Insiders have access to information that is not present public information, and so is not priced into the current value of the stock.

The the strong form of the EMH includes inside info, all info in existence.

Re: Trading halted as U.S. stocks plummet

#727
post #690
post #672

Earlier quoted context omitted.

"There's nothing to do here." Maybe. I imagine it's a trigger for some people to review their investment mix. Not saying panic sell at this particularly bad moment, but downturns are an obvious heads up for people that assumed everything would constantly rise. Changing your mix for future deposits might not be a bad idea if your current mix is higher risk than it should be for your age.

Probably want to change the mix in a few months, not right now.

Assuming you're over-concentrated in equities, yeah. But if you're under-invested in equities, this would be a decent time to start getting more. No telling when the market will bottom out though, so as always be careful.

Re: Trading halted as U.S. stocks plummet

#728

Earlier quoted context omitted.

Yep, over half of GDP growth is tied to population growth. If 2% of humanity is about to die...

I'm wondering if what 2% dies matters. This disease is mostly going to kill people past their prime working years. There are going to be tons of sociological changes. Just speculating here: - Social security could have it's date of insolvency extended. It's currently predicted to be insolvent by 2037. Most pension programs in the world will be relieved of pressure if many of those over 60 years of age die. Many state…

"Social security could have it's date of insolvency extended. It's currently predicted to be insolvent by 2037."

The US Federal government has both a literal and a figurative money printing press. Congressional appropriations create money. Revenue is an obsolete concept for currency issuers. As a Federal program, it is literally impossible for the program to be "insolvent". Social Security benefits can be paid at full rates for as long as Congress decides to do so.

Re: Trading halted as U.S. stocks plummet

#729

Earlier quoted context omitted.

2% of humanity is absolutely, in no way, shape or form about to die. The Korean numbers are approaching 0.5% case fatality rate, and those numbers continue to fall. It's about the same as the flu, and no, the flu isn't killing 2% of humanity either. Y'all need to settle down and get back to work.

South Korea's fatality rate will be somewhere between "deaths / confirmed cases" (currently around 0.7%) and "deaths / (deaths + recoveries)" (currently around 28.5%) - those numbers will eventually converge. What really matters though is to keep the raw number of confirmed cases low enough so that hospitals don't get overwhelmed. If hospitals get overwhelmed, fatality rates go up. So containment is key.

How about "deaths / actual cases"?

This number would be smaller than both of the ones you mentioned, unless you think that somehow all actual cases are detected.

Re: Trading halted as U.S. stocks plummet

#730

It did the trick. Everyone is talking about it and my friends are buying.

When all of your non-trader friends are buying, it's not the time to buy.

"You know it's time to sell when shoeshine boys give you stock tips. This bull market is over." ~ Joe Kennedy
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