What is “pre-market” and “post-market” in stock exchange? Why do stocks change their prices outside of trading hours?
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Extended hours trading occurs off the stock exchanges through other means ([electronic communication networks](https://www.sec.gov/news/studies/ecnafter.htm)).
The biggest warning is that because of the lower trading volume during these hours, price volatility and bid/ask spreads can sometimes can be large (hence why “market” order types aren’t offered)
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