Ancient Filipinos were already trading with China, Japan, Siam (Thailand), Cambodia, India, Burma, Sumtra, Java and other neighbouring islands
Subsequent alternations and amendments were introduced into this new tariff in 1855, 1857 and 1870 but the policy of protection for Spanish merchandise continued unmodified
Philippine products were accorded preferential treatment in Spain. The law of 1882 provided that except tobacco, rum, sugar, cacao, chocolate and coffee, the products of Archipelago were to be exempted from duty
The ancient almojarifazgo(a three percent ad valorem duty) imposed on both imports and exports was established in Manila by Governor Guido R. Lavizaresin 1573
Duty on Chinese goods was increased to six percent in 1606
Zamboanga was opened in 1833
Cebu in 1842
Iloilo and Sulu in 1855
Legaspi and Tacloban in 1874
A price was fixed for the commodities, "which was paid in gold, as a greed upon or in metal bells (gongs) brought from China"
The Chinese writers Chao Ju-Kua(1209-1214) and Wang Tay-Uan(1349) observed that the ancient Filipinos were hones in the commercial dealings
Other foreign traders who brought silks, woolens, bells, porcelains, perfumes, iron tin, coloredcotton cloth and other smell wares to the country paid tariff duties
Philippine exports consisted mainly of rice, coconuts, palm oil, sugar, fibers, straws, cane, dyewoods, lumber and luxuries such as sea snails, beches, defmerk, edible bird nests, tortoise shell, pearls and mother of pearls shells