Scarcity in supply means that:

Scarcity in supply refers to the fundamental economic problem that arises because resources are limited while human wants are essentially unlimited. When we say that supply cannot meet human demand at any one time, we are acknowledging that there is a finite amount of resources available to produce goods and services, and thus, at any given moment, there may not be enough of these goods or services to satisfy everyone's desires.

This concept emphasizes that even if a product is available, the quantity might still be insufficient to meet the demand from consumers. Scarcity forces choices to be made about how to allocate limited resources effectively, which is a core principle of economics. Understanding scarcity helps individuals and societies prioritize which needs and wants to satisfy first, as they cannot have everything due to the constraints of resources.

In contrast, the other options fail to capture the essence of scarcity. The idea of boundless resources does not reflect reality, as all resources are ultimately limited. Similarly, the notion that supply can meet human demand at all times contradicts the definition of scarcity, and saying that human wants are unlimited, while true, does not directly address the constraints placed on supply. Therefore, recognizing that supply cannot meet demand at any given point is crucial for understanding the implications of scarcity in economics.