Why? I see no positive news & SP has been in decline since mid Feb peak.
What has happened with today's micro flash-crash, anyone understand it?
You must be logged on to see external links
I found an explanation today (most of it has bounced bacl already):
What is a flash crash?
When the stock markets are open, buyers and sellers are constantly trading equities. This includes retail investors, institutional investors, and hedge funds. Nowadays this happens too quickly to comprehend, large numbers of orders take place in fractions of a second. One branch of this is known as high-frequency trading. Powerful computers make the trades, and as prices fluctuate, they’re actioned depending on pre-determined instructions and market conditions. A flash crash is when prices dip exponentially low for a short period.
How does a flash crash happen?
A discrepancy in high-frequency computer trading leads to a sudden influx of sell orders, which rapidly magnifies price drops causing a flash crash. As the prices dramatically decline, they trigger further stop losses and the situation escalates until buy orders are triggered and the situation reverses. It’s a flash crash rather than a regular stock market crash if the market recovers within several minutes.
Many traders use margin, which means they borrow money to trade, similar to a bank overdraft. The broker has algorithms set up that flag any major losses, automatically closing trades. This is the sort of situation that can exacerbate a flash crash. So, for long-term investors, the occurrence of a flash crash is less of an issue than it can be for day traders.
That’s because long-term investors are much less likely to be trading on margin. Plus, investing for the future means choosing quality companies that stand the test of time. All shares experience some level of volatility, but by focusing on investing in companies with a solid business model and competitive outlook, wealth accumulation is more likely.
The micro flash crash this week is being blamed for an index-wide drop felt across financial markets globally. This included the FTSE 100. It happened around midday in Europe and simultaneously affected the Wall Street futures market in New York. Nevertheless, this is not something I’d worry about as a long-term investor.