This case does not directly illustrate this, because productivity increased 5%. If in the next quarter that productivity gain shrinks, that would demonstrate more clearly the law of diminishing marginal productivity. This is because, for example, if the worker is already working 49 hours in a week, if another hour is added the worker will be less productive in that 50th hour than he/she was in the 49th hour.

Labor and productivity are not related to marginal utility. Marginal utility reflects the additional benefit of an additional unit of spending, where spending refers to consumption. The concept is similar to productivity, because that is spending by business on labor, but productivity is related to dollar value output, whereas utility is related to happiness and other personal benefits. The concepts are similar, but they are not the same and increased labor spending is therefore not related to marginal utility.

The case...
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