The NYT featured a bizarre column today by a family farmer who expressed concern that financial reform will drive speculators from the grain market. The column tells readers:

"According to the trading commission, about one-third of the long positions in hard red spring wheat futures, which is what I trade on the Minneapolis Grain Exchange, are owned by speculators. If speculators were driven out of the market, it would be as if I’d lost a third of my customers."

No, that is not quite right. Speculators may buy one-third of the wheat sold on the market, but unlike other customers, they don't keep it. Instead, they resell it. So, if speculators are driven from the market, it would be comparable to eliminating one-third of the buyers and one-third of the sellers, leaving prices on average unchanged.

The profit of speculators come at the expense of sellers and consumers. This may be an acceptable price, if they lend stability to the market. In effect, speculators can absorb the risk of price swings. However, there are reasons to believe that they can also contribute to price swings, making the market less stable. If this is the case, then their profits are a pure loss to the economy. It is also possible that the volume of speculation in the market far exceeds what would be necessary to stabilize prices. In this case the excess speculation would be a drain on the economy.

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