Which of these occurrences is NOT a source of productivity growth?

Question

Quizplus · Accepted Answer

An increase in the level of consumption spending is not a source of productivity growth. Productivity growth is measured as an increase in output per input, such as an increase in the amount of goods produced per hour worked. Consumption spending refers to the amount of goods and services that consumers purchase, which does not necessarily lead to an increase in production efficiency. A through D are all factors that can lead to productivity growth, as they increase the output per input.

Which of These Occurrences Is NOT a Source of Productivity