File:Object of economics, a three-cornered relation, 1889.jpg
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![File:Object of economics, a three-cornered relation, 1889.jpg](https://upload.wikimedia.org/wikipedia/commons/thumb/b/b4/Object_of_economics%2C_a_three-cornered_relation%2C_1889.jpg/736px-Object_of_economics%2C_a_three-cornered_relation%2C_1889.jpg?20170403203520)
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