What Is Economics?

What you’ll learn to do: explain what economics is and explain why it is important

Most people think of money when they think of economics. While that is certainly one aspect of it, economics is about a lot more than money. Really, it is a study about decision-making and choices, and how scarcity and competition lead people to behave.

Watch It

Watch this video for a brief overview of economics. You’ll often encounter videos like this, enclosed inside of “Watch It” boxes, in this course. These are highly recommended and serve as wonderful tools to review and enhance your understanding of the concepts presented. Even if you feel like you understand the material in the reading, it is worthwhile to watch the videos.


In order to understand economics, it’s important to master a set of key definitions and understand how they interconnect. These concepts will be used many times throughout the course. At the most basic level:

  • Scarcity means that there are never enough resources to satisfy all human wants
  • Economics is the study of the trade-offs and choices that we make, given the fact of scarcity
  • Opportunity cost is what we give up when we choose one thing over another

In this section, we will spend more time with these definitions, and understand how they’re used in the context of this discipline.

Learning Objectives

  • Describe scarcity and explain its economic impact
  • Describe factors of production
Photo of Kansas summer wheat and storm panorama: dark purplish sky, brilliant golden wheat field.

Figure 1. Food, like the wheat shown here, is a scarce good because it exists in limited supply.


The resources that we value—time, money, labor, tools, land, and raw materials—exist in limited supply. There are simply never enough resources to meet all our needs and desires. This condition is known as scarcity.

At any moment in time, there is a finite amount of resources available. Even when the number of resources is very large, it’s limited. For example, according to the U.S. Bureau of Labor Statistics, in 2016, the labor force in the United States contained more than 158 million workers—that’s a lot, but it’s not infinite. Similarly, the total area of the United States is 3,794,101 square miles—an impressive amount of acreage, but not endless. Because these resources are limited, so are the numbers of goods and services we can produce with them. Combine this with the fact that human wants seem to be virtually infinite, and you can see why scarcity is a problem.

Try It

Throughout the course, you will find these “Try It” boxes with questions to help you check your understanding and apply the concepts from the reading. Choose an answer, then select “check answer” to get feedback about how you did.


When faced with limited resources, we have to make choices. Again, economics is the study of how humans make choices under conditions of scarcity. These decisions can be made by individuals, families, businesses, or societies.

Let’s consider a few decisions that we make based on limited resources. Take the following:

1. What classes are you taking this term?

Are you the lucky student who is taking every class you wanted with your first-choice professor during the perfect time and at the ideal location? The odds are that you have probably had to make trade-offs on account of scarcity. There is a limited number of time slots each day for classes and only so many faculty available to teach them. Every faculty member can’t be assigned to every time slot. Only one class can be assigned to each classroom at a given time. This means that each student has to make trade-offs between the time slot, the instructor, and the class location.

2. Where do you live?

Think for a moment, if you had all the money in the world, where would you live? It’s probably not where you’re living today. You have probably made a housing decision based on scarcity. What location did you pick? Given limited time, you may have chosen to live close to work or school. Given the demand for housing, some locations are more expensive than others, though, and you may have chosen to spend more money for a convenient location or to spend less money for a place that leaves you spending more time on transportation. There is a limited amount of housing in any location, so you are forced to choose from what’s available at any time. Housing decisions always have to take into account what someone can afford. Individuals making decisions about where to live must deal with limitations of financial resources, available housing options, time, and often other restrictions created by builders, landlords, city planners, and government regulations.

Watch it: Scarcity and Choice

Throughout this course you’ll encounter a series of short videos that explain complex economic concepts in very simple terms. Take the time to watch them! They’ll help you master the basics and understand the readings (which tend to cover the same information in more depth).


As you watch the video, consider the following key points:

  1. Economics is the study of how humans make choices under conditions of scarcity.
  2. Scarcity exists when human wants for goods and services exceed the available supply.
  3. People make decisions in their own self-interest, weighing benefits and costs.

The Problem of Scarcity

Every society, at every level, must make choices about how to use its resources. Families must decide whether to spend their money on a new car or a fancy vacation. Towns must choose whether to put more of the budget into police and fire protection or into the school system. Nations must decide whether to devote more funds to national defense or to protecting the environment. In most cases, there just isn’t enough money in the budget to do everything.

Economics helps us understand the decisions that individuals, families, businesses, or societies make, given the fact that there are never enough resources to address all needs and desires.

Try It


Economic Goods and Free Goods

Most goods (and services) are economic goods, i.e. they are scarce. Scarce goods are those for which the demand would be greater than the supply if their price were zero. Because of this shortage, economic goods have a positive price in the market. That is, consumers have to pay to get them.

What is an example of a good which is not scarce? Water in the ocean? Sand in the desert? Any good whose supply is greater than the demand if their price were zero is called a free good, since consumers can obtain all they want at no charge. We used to consider air a free good, but increasingly clean air is scarce.

Try It


Productive Resources

Having established that resources are limited, let’s take a closer look at what we mean when we talk about resources. There are four productive resources (resources have to be able to produce something), also called factors of production:

  • Land: any natural resource, including actual land, but also trees, plants, livestock, wind, sun, water, etc.
  • Economic capital: anything that’s manufactured in order to be used in the production of goods and services. Note the distinction between financial capital (which is not productive) and economic capital (which is). While money isn’t directly productive, the tools and machinery that it buys can be.
  • Labor: any human service—physical or intellectual. Also referred to as human capital.
  • Entrepreneurship: the ability of someone (an entrepreneur) to recognize a profit opportunity, organize the other factors of production, and accept risk.

Try It


Watch It

Productive resources and factors of production are explained again in more detail in the following video:



economic goods:
goods or services a consumer must pay to obtain;  also called scarce goods
free goods:
goods or services that a consumer can obtain for free because they are abundant relative to the demand
productive resources:
 the inputs used in the production of goods and services to make a profit: land, economic capital, labor, and entrepreneurship; also called “factors of production”