Mr. Pirrong and the University of Houston are not alone in publicly defending speculation while accepting financial help from speculators. Other researchers have received funding or paid consulting jobs courtesy of major commodities traders including AIG Financial Products, banks including the Royal Bank of Canada or financial industry groups like the Futures Industry Association.

One of the most widely quoted defenders of speculation in agricultural markets, Mr. Irwin of the University of Illinois, Urbana-Champaign, consults for a business that serves hedge funds, investment banks and other commodities speculators, according to information received by The Times under the Freedom of Information Act. The business school at the University of Illinois has received more than a million dollars in donations from the Chicago Mercantile Exchange and several major commodities traders, to pay for scholarships and classes and to build a laboratory that resembles a trading floor at the commodities market.

Mr. Irwin, the University of Illinois and the Chicago exchange all say that his research is not related to the financial support.

Underwriting researchers and academic institutions is one part of Wall Street’s efforts to fend off regulation.

The industry has also spent millions on lobbyists and lawyers to promote its views in Congress and with government regulators. Major financial companies have also funded magazines and websites to promote academics with friendly points of view. When two studies commissioned by the Commodity Futures Trading Commission, the financial regulatory agency, raised questions about the possible drawbacks of speculation and of high-frequency trading, lawyers for the Chicago exchange wrote a letter of complaint, saying that its members’ proprietary trading information was at risk of disclosure, and the research program was shut down.

The result of the various Wall Street efforts has been a policy stalemate that has allowed intensive speculation in commodities to continue despite growing concern that it may harm consumers and, for example, worsen food shortages. After a two-year legal delay, the futures trading commission this month introduced plans for new limits on speculation. Some European banks have stopped speculating in food, fearing it might contribute to worldwide hunger.

Mr. Pirrong, Mr. Irwin and other scholars say that financial considerations have not influenced their work. In some cases they have gone against the industry’s interests. They also say that other researchers with no known financial ties to the industry have also raised doubts about any link involving speculation and soaring prices.