The 80/20 Principle Book by Richard Koch

"The 80/20 Principle can and should be used by every intelligent person in their daily life...It can multiply the profitability of corporations and the effectiveness of any organization. It even holds the key to raising the quality and quantity of public services while cutting their cost... The 80/20 Principle asserts that a minority of causes, inputs, or effort usually lead to a majority of the results, outputs, or rewards. Taken literally, for example, 80 percent of what you achieve in your job comes from 20 percent of the time spent. Thus for all practical purposes, four fifths of the effort--a dominant part of it--is largely irrelevant."

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1) Minor creases or bends, 2) Slight yellowing of pages, 3) Faint markings or name written inside

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