Ooops! I made a mistake in shares purchased in my example: A= 10416.66/66.667 = 156.25 B= 10416.66/(N*1.2) = 10416.66/(110*1.2)= 78.9 A-B = 156.25-78.9= 77.35 shares bought 77.35 shares bought*$66.667 = $5156.69 invested It should be: A= 10416.66/66.667 = 156.25 B= N*1.1 = 110 * 1.1 = 121 A-B = 156.25 - 121= 35.25 shares purchased 35.25 shares purchased * $66.667= $2350 invested This is still a progressive buy, but not as exaggerated as my original calculation.