About 17 percent of the museum's financing comes from the state government, and the majority from a number of private donors.
A cut of $200 million in the board's budget would be equivalent to less than 2 percent of its financing.
The mayors' group estimates that the cities lost 75 percent of their financing for eight key urban programs since 1980.
Citicorp currently auctions $100 million in paper each week, accounting for less than 1 percent of its overall financing.
Some analysts maintain that when debt goes above, say, 80 percent of a company's total financing, it has really become equity.
More than 90 percent of its financing in the months ahead should go to large, established clients, the company said.
The Smithsonian receives about 70 percent of its financing from the federal government.
These projects depend on 1 percent city loans for 70 percent of their financing.
On Long Island, poorer districts receive 75 to 80 percent of their financing from property taxes, school officials said.
The city provides 80 percent of its financing.