In the last five years, (up 5-days in a row) it has happened 21 times, the average final return five-day return has been +0.13%.
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Totals and average return for lowest return, highest return, and final return in the next 5-days.
Obviously, there is no edge in trying to short, but there is a slight edge in slowing down. The Small-cap index has only been up 6 consecutive days 13 times in the last 5-years, and only 5 times up seven days in a row.