Economic resources (Land, Labour, Capital and Enterprise) are limited. People want more than they need. As wants are unlimited but resources are limited, there will never be enough to satisfy everyone at once. This is what creates scarcity and it is why choices have to be made, and these choices lead to trade-offs.
Every decision involves a trade-off. A trade-off means having to give up one option in order to gain another.
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When there is not enough of a resource available for everyone who wants it, the price people are willing to pay for it rises. This is how markets work.
Scarcity for Households
Households and individuals have limited income, time and skills. For example, a student may want to work part-time to earn income but also needs to study for exams. Time is limited for them, so working more hours means fewer hours of studying. They face a decision: to improve their standard of living in the short term by earning more now, or to focus on studying for the longer-term benefit of better exam results and future opportunities.
Scarcity for Businesses
A business has limited capital, staff, equipment and time. It cannot do everything at once, so it must choose where to direct its resources.
Investing in new machinery may mean there is no budget left to hire additional staff. Choosing one option means giving up another.