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Captive Supply: Correlation v. Causation |
| OCM Economics Fellow Dr. Robert Taylor |
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GIPSA recently released their $4.5 million interim captive supply report, “Spot and Alternative Marketing Arrangements in the Livestock and Meat Industries.” The interim report largely regurgitates previous studies of captive supply. While devoid of real analysis of hard data – they claim that data analysis will come in the final report due in 2006 – the authors nevertheless conclude that benefits of vertical integration are “clear” but that impacts on the cash market are “elusive.” The report states,
The causal link has been elusive? Elusive? Causal mechanisms were not elusive to Bob Peterson, long-time cattle buyer and former CEO of IBP. He identified several causal mechanisms in talks to cattlemen in 1988 and 1994. In particular, he emphasized the leverage the packer obtained in the cash market with captive supplies. He stated,
In three lengthy speeches Peterson clearly and effectively identified how captive supplies could be used to manipulate the cash market. Yet, his warnings and threats about manipulative use of captive supply have been unheeded by economists in several USDA studies costing taxpayers Common sense application of basic economic principles reveals numerous causal mechanisms, including:
How was the evidence weighed in arriving at conclusions in the GIPSA study? We don’t know1. Were both sides represented? Obviously the independent cattlemen were not represented. There is no mention in the $4.5 million interim report of extensive Pickett evidence. There is no mention of several common-sense causal mechanisms. There is no mention of Bob Petersons warnings. Early studies of captive supply presumed causation. Then, in a 1996 GIPSA funded study, Schroeter and Azzam advanced a hypothesis that the negative relationship between captive supply and cash price was due to the correlation2 of captive supplies and captive feeders’ expectation of price. Their hypothesis may have been well intentioned3, but there was no apparent weighting of evidence. Implicit in their report is the presumption that any argument for correlation, no matter how far-fetched, trumps any causal explanation. Unfortunately, the Arguments for and against both the correlation and causation explanations should be objectively weighed. Since the captive supply issue falls under the Packers and Stockyards Act and perhaps under the Sherman and Clayton Antitrust Acts, the preponderance of evidence standard (more likely than not) is the appropriate legal standard and thus the appropriate standard for GIPSA studies. Academic standards should not apply, particularly standards that are never disclosed. The GIPSA report claims that “clear” conclusions are reached about benefits of vertical integration. Yet, they do not report any real numbers to support these clear conclusions. It must not matter that hard evidence in Pickett contradicts most of their so-called clear conclusions. Taxpayers deserve a final report that is based on fairly weighting the evidence – all evidence – by a clearly defined and appropriate evidentiary standard. This should not be a purely academic exercise intended to impress other academics. At this point in the captive supply debate, we need practical, common sense analyses not esoteric academic exercises. Despite several taxpayer-funded captive supply studies spanning over a decade, only a Jury of your peers has looked at the hard facts and carefully weighed the evidence. GIPSA economists have not. Federal Judges have not. After listening to four weeks of testimony followed by five days of careful deliberation, the Pickett Jury verdict (question #4) was that “… use of captive supply proximately caused the cash market price to be lower than it otherwise would have been.”CRT |
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