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From 1871 to 1913, "the average U.S. tariff on dutiable imports never fell below 38 percent [and] gross national product (GNP) grew 4.3 percent annually, twice the pace in free trade Britain and well above the U.S. average in the 20th century," notes Alfred Eckes Jr, chairman of the U.S. International Trade Commission under President Reagan. [53]
This is due to its very complex structure. The substance can be seen with empirical formula B 12 C 3 (i.e., with B 12 dodecahedra being a motif), but with less carbon, as the suggested C 3 units are replaced with C-B-C chains, and some smaller (B 6) octahedra are present as well (see the boron carbide article for structural analysis). The ...