Economics as a social science

Welcome to the World of Economics!

Welcome! You are about to start your journey into Economics. Don’t worry if you’ve heard that Economics is all about complicated graphs and boring numbers—at its heart, it’s actually the study of people. In this first chapter, we are going to look at why Economics is called a "social science" and how economists try to make sense of the messy, unpredictable world we live in.

Think of this chapter as the "rulebook" for how economists think. Once you understand these basics, everything else in your course will start to click into place!

1. Economics as a Social Science

You might be used to sciences like Physics or Chemistry, where you mix two chemicals in a lab and get the same result every single time. Economics is different. It is a social science because it studies human behavior and how individuals, firms, and governments make choices.

Why is it harder than "Hard" Sciences?

In a chemistry lab, you can control the environment perfectly. In Economics, our "laboratory" is the real world. Because humans are unpredictable and have "free will," we don't always act the same way. This makes it much harder to come up with "laws" that are true 100% of the time.

Quick Review: Economics is a social science because it studies how people and society make decisions about using limited resources.

2. Thinking Like an Economist: Models and Assumptions

The real world is incredibly complex. If an economist tried to include every single detail of human life in their theories, they would never get anything done! To solve this, economists use models.

What is an Economic Model?

An economic model is a simplified version of reality. Think of it like a map of a city. A map doesn’t show every single tree, blade of grass, or pebble on the road—if it did, it would be too big to use! Instead, it shows the most important things, like the main roads and landmarks, to help you get where you’re going.

The Need for Assumptions

To create these models, economists have to make assumptions. An assumption is something we "pretend" is true to make a problem easier to analyze. For example, when studying how much bread people buy, we might assume that everyone acts rationally (trying to get the best deal for their money).

Example: If the price of your favorite chocolate bar goes up, an economist might model that you will buy less of it. They assume you want to save money, even though in real life, you might buy it anyway because you're having a really bad day!

Key Takeaway: Economists use simplified models and assumptions to explain how the economy works without getting bogged down in every tiny real-world detail.

3. The Power of "Ceteris Paribus"

This is one of the most important terms you will learn in your first week. It’s Latin, and it sounds fancy, but the meaning is very simple.

Ceteris Paribus means "all other things being equal" or "everything else stays the same."

Why do we use it?

In the real world, millions of things change at the same time. If the price of iPhones goes up, but at the same time everyone gets a massive pay rise, people might actually buy more iPhones. This makes it hard to see the effect of the price change alone.

By using the ceteris paribus assumption, economists can isolate one variable. We say: "If the price of iPhones goes up, ceteris paribus (assuming nothing else like income or fashion trends changes), the demand will fall."

Memory Aid: Think of Ceteris Paribus as "C"onstant "P"arams. You keep everything else constant to see what one change does.

Key Takeaway: Ceteris paribus allows economists to change one thing at a time to see its specific effect, even though the real world is constantly shifting.

4. The Problem with Scientific Experiments

As we mentioned earlier, economists face a big challenge: the inability to make scientific experiments.

If a biologist wants to see how a plant grows, they can put ten plants in a room with no light and ten in a room with lots of light. They control everything. Economists cannot do this with a whole country.

Imagine this: An economist wants to test if raising taxes makes people work less. They can't just ask the government to raise taxes for a week just to see what happens! It would be unfair, expensive, and potentially ruin the economy.

How do economists cope?

Since they can't do lab experiments, economists use:

• Historical data: Looking at what happened in the past when taxes were raised.
• Natural experiments: Looking at two similar countries that made different choices and comparing them.

Did you know? Because we can't do lab tests, two economists can look at the exact same data and come to two completely different conclusions! This is why you often hear politicians arguing about economic policies.

Key Takeaway: Unlike "hard" sciences, Economics cannot conduct controlled experiments. Instead, they must rely on observation and data from the real world, which is much harder to control.

Summary Quick Review Box

1. Social Science: Economics studies human behavior, which is less predictable than physical matter.
2. Models: Simplified versions of reality (like maps) used to explain complex ideas.
3. Assumptions: Necessary shortcuts taken to make models work.
4. Ceteris Paribus: The "all other things held constant" rule used to isolate the effect of one change.
5. No Lab Tests: Economists can't run controlled experiments on society; they must use real-world data.

Don't worry if this seems a bit abstract at first! Once we start looking at Supply and Demand in the next sections, you will see exactly how we use these "tools of the trade" to understand the world.