Which of the following is NOT a factor shown on a production possibilities curve?

A production possibilities curve (PPC) illustrates the maximum outputs of two goods that an economy can produce, given its available resources and technology, while efficiently allocating those resources. The key features represented on a PPC include the efficiency of resource allocation, trade-offs between different goods, and the concept of opportunity costs.

Resource allocation efficiency is a fundamental aspect of the PPC, as points on the curve represent the most efficient use of resources. Any point within the curve indicates inefficiencies, while points outside are unattainable with current resources. Thus, this aspect is crucial to understanding how resources should be optimally distributed to maximize production.

Trade-offs relate directly to the PPC, as choosing to produce more of one good inherently means producing less of another due to limited resources. This illustrates the concept of opportunity costs, which represents the value of the next best alternative foregone when a resource is allocated to a particular use.

On the other hand, preference changes over time do not directly illustrate any of the core principles of the PPC. While consumer preferences can influence production decisions and shifts in the PPC, they are not depicted on the curve itself. Instead, these changes usually require adjustments in resource allocation or production methods rather than being intrinsic factors shown within the PPC framework. Thus