All or Nothing Days Becoming More Common Than Uncommon

Regular readers of this site are now familiar with the term 'all or nothing days.'  We consider 'all or nothing' days in the market to be days where the net daily A/D reading in the S&P 500 exceeds plus or minus 400.  With today's A/D reading of -470, there have now been 42 'all or nothing' days for the S&P 500.  At this rate, 2011 is now on pace to see 57 all or nothing days, which would eclipse the record high reading we saw back in 2008.  

The most shocking development of late is how common 'all or nothing days' have become.  Up until a few years ago, these types of days were pretty rare, but in the 42 trading days since the start of August, more than half of them (22) have been 'all or nothing'.

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