If you bought SPY at the first second of regular trading hours every morning for the last 25 years, and sold each day just before close, you would be down 4.4%. Doing the reverse, you’d be up 571%.

by doublecastle https://www.nytimes.com/2018/02/02/your-money/stock-market-after-hours-trading.html Check out the graph about halfway down in that article. It’s revelatory. If you had bought the SPY at the last second of trading on each business day since 1993 and sold at the market open the …

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