What is a key assumption made by the production possibilities curve?

The correct choice highlights a fundamental assumption made by the production possibilities curve (PPC), which is that technology remains constant during the period analyzed. This is essential because the PPC illustrates the maximum potential output of an economy based on its current resources and technology. By holding technology constant, the curve demonstrates the trade-offs between the production of different goods, allowing for an analysis of opportunity costs and efficiency in resource allocation.

If technology were to change during the analysis, it could shift the PPC, thus altering the output possibilities and invalidating the conclusions drawn from the initial curve. Therefore, this assumption helps to provide a clear framework for understanding the economy's capabilities without the complications introduced by technological advancements.