“If corn needs to go to $9, do we have to do it immediately? – Corn Price Limits and Margin Requirements

Higher Limits Increase Brokerage Risk, Capital Requirements

AUGUST 15, 2011

By: Fran Howard

The CME Group announced Aug. 9 that it had received Commodity Futures Trading Commission (CFTC) approval to increase daily price limits for corn futures and options. As a result, daily price limits for Chicago Board of Trade corn futures, corn options, and mini-sized corn futures will increase to 40 cents per bushel from the current 30 cents per bushel, effective Monday, Aug. 22.

David Lehman, managing director of commodity research and product development for the CME Group, says that increasing the daily trading limit should reduce the number of limit moves in corn, thus decreasing volatility. But not everyone is buying that premise.

Participants in AgWeb’s online poll overwhelmingly oppose the CME Group’s decision to raise the daily trading limits on corn. More than 81% of those who responded to the poll opposed the increased limit, while 15% favored the increase and 3% were unsure.

Under the current 30-cent limit, if prices close limit up, producers who hedged their crop would need to replenish their margin accounts with $1,500 for every 5,000-bushel futures contract sold, says Chad Hart, agricultural economist with Iowa State University. Once the limit is expanded to 40 cents, a limit-up day would require hedgers to put $2,000 into their margin account for every contract sold.


“That’s a lot of capital to be locking up in a margin account,” says Hart. Partly, producers hedge their corn crop because they want to hold it to sell it at a later date at a higher price, and as such might be short on capital to come up with the margin calls, he says. The expanded limit would thus require better cash management or more caution on the part of hedgers.

“If you are a grower who has never hedged before, it doesn’t affect you,” says Hart. Only those producers who have been hedging under the current, lower limit will notice a difference in the capital requirements.

While coming up with more capital could be painful for some producers, the CME Group argues that longer term, an expanded limit should mean fewer limit-up days and thus fewer margin calls.

In a paper titled “Corn Price Limits and Margin Requirements” in which the CME Group addresses the concern that hedge margins will increase following an increase in daily limits, the authors note: “Price limits do represent the maximum daily price change, and thus represent an approximate upper limit for margin requirements. However, evidence does not show that Corn futures margins increase following an increase in price limits.”

Following the 1993 and 2008 increases in the daily corn limits, margin requirements increased prior to the date the limit was expanded, but margins did not increase following implementation of higher limits. Instead, in the month following these limit increases, margin requirements actually fell. “These results suggest that high volatility and not higher price limits caused margin increases,” the paper notes.

Not everyone, however, sees it that way. “I think expanded limits will increase volatility,” says Diana Klemme, vice president with Grain Service Corporation, Atlanta. “When the morning rhetoric says it’s going to be a limit-up day, the stampede will push further before selling comes in to stabilize the market. I can’t accept it will decrease volatility.”


In some ways, Klemme says the expanded daily limit on corn makes sense with corn prices now trading in the $5/bu. to $8/bu. range instead of the $2/bu. to $4/bu. range.

Daily limits, regardless of whether they are 30 cents or 40 cents, act as circuit breakers, increasing the time it takes for prices to move to new levels, whether that’s up or down.

“If corn needs to go to $9, do we have to do it immediately? The limits don’t prevent prices from going to where they need to go, but limits act like circuit breakers, which allows people to get their margin money lined up,” she adds.

Expanded limits will also increase a brokerage house’s single-day risk profile, which could affect some producers.

For instance, Klemme says, if a brokerage firm has customers who have been slow in sending in their margin money, it might insist on a one-day payment now that more money will be at stake when before the firm might have allowed a couple of days.

The brokerage firm could also limit the number of contracts that slow-paying customers can hold.

“I’m a firm believer that circuit breakers serve a purpose and the world will not be harmed if we take longer to get to a new price level,” Klemme says.

Stopping black box trading, which is when computer algorithms determine timing, price, or quantity of orders often without human assistance, is a good thing, she adds.

Old style Iowa Windmill at sunset ~ Iowa in July“Old style Iowa Windmill at sunset ~ Iowa in July”

For More Information

Visit AgWeb’s Market Center.


• CFTC Closes Loophole to Regulate Commodity Position Limits

• CFTC Changes On Tap

• Is Potential CFTC Ruling More Important than Farm Bill?

Read more market news and analysis.


Rows of Iowa Tall Corn, July 2011 - "Going Up and Down the Rows"

Rows of Iowa Tall Corn, July 2011 – “Going Up and Down the Rows”

Marketing Grain to be considered in the future as one of our workshop topics under the broader category of “Farm Management” for the Generation Farmers of Southwest Iowa: we have discovered a need to clarify and to simplify the terminology so that it is meaningful not only to us, but also to the generation farmers who will follow us.

  • What are the major factors affecting grain prices at this time?
  • What non-farming  factors affect grain prices?
  • Is there really any best time to sell your crop?
  • Grain storage for Generation Farmers to be considered
  • What are our real options for marketing our grain?
  • What is “black box trading”?
  • Are farmers being taken in by the same factors that ruined the economy in the first place?
  • Have we adequately understood the economic factors that led to the economic downturn?
  • What causes high market volatility and how do we avoid severe price increases and price drops that would be part and parcel of a volatile grain market?

view of the corn field from inside of the farm house ~ Iowa“view of the corn field from inside of the farm house ~ Iowa in July”

  • “Techo-capitalism has removed “place” from the sum of parts that make up “modern” man and it has had a deleterious effect on society, weakening both the community and the family.”                 ~ Robert C. Cheeks ~                                    Does this explain the changes we are seeing in the way that farming is being done?
Bergamot in the Iowa Native Prairie grasses, prairie restoration helps to balance the environment and to invite birds, insect eating birds back to the farm“Bergamot in the Iowa Native Prairie grasses, prairie restoration helps to balance the environment and to invite birds, insect eating birds back to the farm”

                                                                                        Generation Farmers of Southwest Iowa was created to help to build community and to support the on-going concept of the family farm – Please join in this on-going conversation 

A Mills Legacy Networking Group

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