What is a "windfall" profit anyway?

How does it differ from your everyday, run of the mill profit? Is it some absolute number, a matter of return on equity or sales -- or does it merely depend on who earns it?

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Mr. Obama didn't bother to define "reasonable," and neither did Dick Durbin, the second-ranking Senate Democrat, when he recently declared that "The oil companies need to know that there is a limit on how much profit they can take in this economy." Really? This extraordinary redefinition of free-market success could use some parsing.

Take Exxon Mobil, which on Thursday reported the highest quarterly profit ever and is the main target of any "windfall" tax surcharge. Yet if its profits are at record highs, its tax bills are already at record highs too. Between 2003 and 2007, Exxon paid $64.7 billion in U.S. taxes, exceeding its after-tax U.S. earnings by more than $19 billion. That sounds like a government windfall to us, but perhaps we're missing some Obama-Durbin business subtlety.

Maybe they have in mind profit margins as a percentage of sales. Yet by that standard Exxon's profits don't seem so large. Exxon's profit margin stood at 10% for 2007, which is hardly out of line with the oil and gas industry average of 8.3%, or the 8.9% for U.S. manufacturing (excluding the sputtering auto makers).

If that's what constitutes windfall profits, most of corporate America would qualify. Take aerospace or machinery -- both 8.2% in 2007. Chemicals had an average margin of 12.7%. Computers: 13.7%. Electronics and appliances: 14.5%. Pharmaceuticals (18.4%) and beverages and tobacco (19.1%) round out the Census Bureau's industry rankings.

And what about farmers?