Mexico's exports: citrus. If it take the average of the quinquennium 1876-1880 as 100, then the ratio of primary product to industrial product prices had fallen to 93 for the years 1911-1913, and 76 for the quinquennium 1921-1925. ("Relative prices of exports and imports of underdeveloped countries", United Nations, Lake Success, 1949: 22)
país: México
año: 1981
Yvert: aéreo 535
