He said the initial decline in revenues could total between $5 billion and $10 billion.
Hunting is thought to have caused the initial rapid decline, referred to as the primary trigger, although other explanations may be plausible.
After an initial decline, gold prices ended higher, bolstered by concern that the figures could show a widening trade gap.
The recession caused the initial decline in unemployment, but there are economic forces at work that are keeping it high.
After the initial decline, trading was subdued for the rest of the session, he said.
After the initial decline in ridership between 2006 and 2009, service began to increase through 2011.
The initial decline lasted from mid-1929 to mid-1931.
After an initial decline, traffic patterns went back to their normal nightmarish proportions.
But in the days ahead, the dollar could draw some support after the initial decline from the expectation now that the Fed will not lower interest rates.
In the post-Communist nations, after an initial decline, those that are the most democratic have achieved the greatest gains in life expectancy.