Statistics for occurrence #1 of “Mr. Giffen” in entry free-trade of Harper's Encyclopedia of United States History:

...ection upon the comparative table, we shall find that the cases are very few in which the increment does not range as high as from 50 and towards 100 per cent. In a later essay, of January, 1886, Mr. Giffen touches the case of the unskilled laborer. He observes that the aggregate proportion of unskilled to skilled labor las diminished—a fact which of itself forcibly exhibits the advance of the ...
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