President George W. Bush joined the gas-prices-are-too-high chorus in Washington by calling for an investigation of possible price-fixing by oil companies. He also suspended shipments to the Strategic Petroleum Reserve and relaxed environmental regulations that require fuel additives such as ethanol. The latter two moves should reduce gas prices temporarily but what good is a price-fixing probe? Every time the price of gas goes up, politicians pander to constituents by demanding a gas-gouging investigation. Crude oil prices have soared recently to more than $73 a barrel, so is it any mystery why gas prices are nearing $3 a gallon? According...