The document discusses the basic economic problem of scarcity. It explains that resources are limited while wants are unlimited, leading to scarcity. This forces economic agents like individuals, firms, and governments to make choices that involve opportunity costs. The production possibility curve (PPC) is used to show the maximum possible combinations of two goods an economy can produce with full employment of its limited resources. The PPC can shift inward or outward due to changes in the quantity and quality of resources.