The idea that it takes 80 percent of your time to clean up the last 5 percent of your house illustrates that

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The statement suggests that as more and more cleaning is done, the marginal cost (in terms of time and effort) of cleaning up each additional 1% of the house increases. This illustrates the principle of diminishing marginal returns, where at some point, each additional unit of input (in this case, cleaning) yields lower and lower marginal benefits, while the marginal costs continue to rise. Therefore, the marginal cost of cleaning up slopes upward.

The Idea That It Takes 80 Percent of Your Time