In Louisiana, so far the only known coastal victim of the gusher's oil, tourists and seafood wholesalers spend about $1.5 billion a year, according to government figures. Mississippi and Alabama rely on tourism and seafood for at least $5 billion.
Moody's noted that personal income jumped nearly 10 percent in Alaska in 1989 after the Exxon Valdez spill.
But ultimately the spill cost Alaska about $2.8 billion in economic activity, thanks in part to the severe damage to the Pacific herring fishery.
The Moody's report saves some of its grimmest hypotheticals for Florida, which has yet to be linked with any oil from the Deepwater well.
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