Thanks. Carnegie warned against mixing up differen
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"The man who is director in a half dozen railroads and three or four manufacturing companies, or who tries at one and the same time to work a farm, a factory, a line of street cars, a political party and a store, rarely amounts to much. He may be concerned in the management of more than one business enterprise, but they should all be of the one kind, which he understands. The great successes of life are made by concentration." -Andrew Carnegie, the world's richest self-made man in 1901.