Speculators necessary

So says my mentor Dr. Walter Williams in yesterdays JWR:

Say that today's price of corn is $7 a bushel. I have a hunch that because of Midwest flooding, higher demand due to droughts and war in other parts of the world, that in May 2009, corn will sell for $12 a bushel. I stand to make a lot of money by buying corn now for $7 a bushel, holding it, and in May 2009 selling it for $12 a bushel. If many speculators share my hunch and buy more corn now, today's price, sometimes called the spot price, is going to rise let's say to $10 a bushel.

Higher prices for corn, and everything made from corn, might give rise to consumer complaints. While Congress can't stop the Midwest rain, droughts and wars in far off places, it can scapegoat speculators. Let's say that Congress outlaws the corn futures market, or makes futures trading more costly. Doing so will definitely lower the spot price of corn. The price might return to $7 a bushel, making corn consumption once again "affordable." You might exclaim, "Isn't Congress wonderful?" But what about May 2009?

Suppose the Midwest floods have a significant impact on corn production; there's drought and war in far off places raising the demand for corn exports. What do you predict will be the availability and prices of corn in May 2009 after Congress has outlawed, or made futures trading more difficult? If you answer less corn and much higher prices, go to the head of the class. By outlawing or impeding futures trading in corn, Congress encouraged Americans to ignore the future. Had Congress not interfered, people would use less corn now, making more available in May 2009. Thus, one of very valuable functions performed by the speculator is the allocation of resources over time. It makes sense to take the future into account when making consumption decisions today. The futures market, by the way, is no bed of roses. My hunch about corn supply and demand conditions might be dead wrong. Its May 2009 price might be $3 a bushel and I would have to sell at a loss. Futures trading is risky business.