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Look for the complete U.S. Stamp Market Index once per month in Linn's Stamp News. Soft demand for modern airmail stamps brought declining prices to that component of the composite index. Overall, Linn's U.S. Stamp Market Index crept up just 0.3 percent for the month, from 641.7 to 643.6. Nineteenth-century stamps rose a scant 0.6 percent in March and now stand 7.8 percent above the March 2000 level. Pricing of fine to very fine stamps seems to reflect demand for very fine stamps, and prices in these two grades tend to rise in tandem, though at different rates.