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Revisiting corn stocks numbers

10/10/2011 @ 3:46pm

While the USDA’s estimate of the September 1, 2011 inventory of old crop corn is old news, there are ongoing questions surrounding the quarterly stocks estimates.  For corn, quarterly stocks estimates have not been well anticipated since June 2010.

The June 1, 2010 estimate of stocks was surprisingly small and implied feed and residual use during the previous quarter that was too large.  The September 1, 2010 estimate of stocks was larger than anticipated based on the level of June 1 stocks, but seemed to “correct” for the small estimate in June.  The implied feed and residual use for the 2010-11 marketing year based on that estimate was reasonable.

The December 1, 2010 and March 1, 2011 estimates of stocks were marginally smaller than expected and implied a high rate of feed and residual use during the first half of the marketing year, 8 percent above that of the previous year.  In contrast, the June 1, 2011 estimate of stocks was much larger than expected and implied a very dramatic slowdown in the rate of feed and residual use during the third quarter of the 2010-11 marketing year.   Unlike in the previous year, the September 1, 2011 stocks estimate did not correct for the large June estimate, but instead compounded the implications of the June estimate.  Implied feed and residual use of corn during the final quarter of the marketing year was unreasonably small and implied use for the last half of the 2010-11 marketing year was a third less than in the same period a year earlier. Such a large decline seems unreasonable given that the number of livestock fed was larger, average slaughter weights were about equal, implied feed and residual use of wheat was 45 million bushels less, feeding of soybean meal was down 4 to 5 percent, and feeding of distillers grains was only about 3 percent larger.  Calculated feed and residual use of corn for the 2010-11marketing year is unreasonably small.  The estimate of large September 1 stocks also appears at odds with the on-going very strong corn basis.

Explanations offered for the surprisingly large September 1 stocks include the possibility that the 2010 corn crop was under-estimated and/or the amount of corn used for ethanol production has been over-estimated.   If correct, either of these explanations would result in a larger calculation for feed and residual use and might make sense if the September stocks estimate was the only one available for the year.  However, neither explanation is consistent with the level of stocks on December 1, 2010 or March 1, 2011.  In addition, the size of errors implied by these explanations would have to be very large to result in a reasonable calculation of feed and residual use for the year.  Some speculate that stocks of the newly harvested crop were included in the estimate of “old crop” stocks.  Such an inclusion would require unique reporting errors by survey respondents and those errors would have to be very large to result in a reasonable calculation of feed and residual use in the last quarter of the year.  There is not an obvious problem with USDA methodology that has produced reasonable stocks estimates until recently.   

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