What is the primary reason why opportunity costs arise in economics?

Opportunity costs arise in economics primarily because resources are limited while our wants and needs are virtually unlimited. When we make a choice to use our time, money, or energy in one way, we must give up the next best alternative. For example, if you decide to spend your Saturday studying for an exam instead of going to a concert, the opportunity cost is the enjoyment and experience you miss out on at the concert. This concept helps us understand that every decision has trade-offs, and it encourages us to think carefully about what we value most. By recognizing opportunity costs, we can make better choices that align with our goals and priorities.