Letters to the Editor
To the Editors:
Wayne Thorp’s July 2009 AAII Journal article [“2009 Mid-Year Stock Screen Review: Is a Market Rebound in Progress?”] contains a table showing performances of various stock categories. There is a phenomenon in this table that I see frequently. It puzzles me.
The last section of Table 1 shows the year-to-date (YTD) results for “All Exchange-Listed Stocks” and for a variety of subsets. The “All Stock” YTD return is 27.1%, yet no single subset comes close to that.
How can the total return for the stock market be more than the sum (or average) of its component parts? What am I missing?
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