Final answer:
Zero-sum thinking refers to a scenario where a gain for one party necessitates an equivalent loss for another, demonstrating the finite nature of resources in certain competitive situations.
Step-by-step explanation:
Zero-sum thinking means that one can only gain at the expense of someone else. This concept exemplifies a situation where resources are finite and a gain for one party necessarily results in a loss for another, as in a zero-sum game. Real-world examples include competing states seeking control over limited resources or businesses aiming for market dominance in monopoly or oligopoly scenarios. In contrast, non-zero-sum scenarios, such as those in perfect competition, entail the possibility of all parties benefiting without directly causing loss to others.