Welcome to Economic Methodology!
Welcome to your first steps in AS Level Economics! Before we dive into how markets work or how countries grow, we need to understand how economists think. Think of this chapter as the "instruction manual" for the subject. We will explore why Economics is called a science, how to tell the difference between a fact and an opinion, and why "time" is such a big deal in our calculations.
Don't worry if some of these terms sound a bit "academic" at first—we’ll break them down using everyday examples that make sense!
1.2.1 Economics as a Social Science
You might think of "science" as people in white lab coats mixing chemicals. Economics is a bit different, but it still follows a scientific process. It is a social science because it studies human behavior and how people make choices to solve the problem of scarcity.
How is it like a "Hard Science" (like Chemistry)?
Economists use the scientific method:
- Observation: They watch how people behave (e.g., people buy more burgers when the price drops).
- Hypothesis: They create a "guess" or theory to explain this (e.g., "Lower prices increase demand").
- Predictions: They use the theory to predict the future.
- Testing: They look at data to see if their prediction was right.
How is it different?
In a lab, a scientist can control everything. In the real world, humans are unpredictable! We can't put the whole world’s population into a test tube. This is why economic "laws" are more like "general tendencies" rather than 100% certainties.
Quick Review Box: Economics is a social science because it uses scientific methods to study how unpredictable humans allocate scarce resources.
1.2.2 Positive and Normative Statements
This is a favorite topic for exam questions! Economists deal with two types of statements. One is based on hard evidence, and the other is based on what we value.
Positive Statements (The Facts)
A positive statement is objective. It can be tested, proven, or rejected by looking at data. It describes "what is."
Example: "The current unemployment rate in our country is 5%." (We can check the records to see if this is true or false).
Normative Statements (The Opinions)
A normative statement is subjective. It involves a value judgement (an opinion about what is good or bad). It describes "what ought to be" or "what should happen."
Example: "The government should increase the minimum wage to help the poor." (This is an opinion; you cannot "prove" the word "should").
Memory Aid: The "S" Trick
Positive = Proven (or can be tested with data).
Normative = Non-testable (contains words like "should," "ought to," "fair," or "unfair").
Common Mistake: Students often think "Positive" means something "good." In Economics, "Positive" just means "testable." For example, "Pollution is increasing by 10% every year" is a positive statement, even though pollution is a bad thing!
Key Takeaway: Use data for positive statements; use values/opinions for normative statements.
1.2.3 Meaning of the term "Ceteris Paribus"
Economists love using Latin! Ceteris paribus translates to "all other things remaining equal."
Why do we use it?
In the real world, millions of things change at once. If the price of iPhones drops AND people suddenly get richer at the same time, it’s hard to tell which one caused the increase in sales. To simplify things, economists change only one variable and freeze everything else.
An Everyday Analogy:
Imagine you are trying to see if a new pair of running shoes makes you faster. To get a fair result, you must use Ceteris Paribus: you must run on the same track, in the same weather, and with the same energy level. If you run in the rain with the new shoes, you won't know if your speed changed because of the shoes or the slippery track!
Key Takeaway: We use Ceteris Paribus to isolate the relationship between two specific variables (like Price and Quantity).
1.2.4 Importance of the Time Period
In Economics, time isn't measured in minutes or hours. Instead, it’s measured by how much flexibility a producer has to change their inputs (like land, labor, and machinery).
1. The Short Run
The short run is a period where at least one factor of production is fixed. Usually, this is "capital" (your building or machinery).
Example: You run a pizza shop. Suddenly, 100 people walk in. In the short run, you can hire more staff (variable factor), but you can't build a bigger kitchen or buy a new oven instantly (fixed factor).
2. The Long Run
The long run is a period where all factors of production are variable. You have enough time to expand your factory, buy new machines, or move to a new location.
Example: After a year of high demand, you decide to rent the shop next door and install three new pizza ovens.
3. The Very Long Run
The very long run refers to a period where technology and social/political factors can change. It’s not just about more machines; it’s about new types of machines or new ways of doing things.
Example: In the very long run, pizzas are 3D-printed by robots, or everyone starts eating synthetic food instead of dough.
Did you know? There is no set number of days for the "Short Run." For a street food vendor, the long run might be just one week (time to buy a new cart). For a nuclear power plant, the long run might be 10 years!
Quick Review Summary:
• Short Run: Some things are fixed (e.g., the size of your shop).
• Long Run: Everything can be changed (e.g., you can build a bigger shop).
• Very Long Run: Technology itself changes (e.g., the shop is replaced by an app).
Chapter Summary Checklist
Before you move on to Section 1.3: Factors of Production, make sure you can:
- Explain why Economics is a social science.
- Identify a positive statement vs. a normative statement in an exam question.
- Define ceteris paribus and explain why it's useful for making models.
- Explain the difference between the short run and long run based on "fixed" and "variable" factors.
Great job! You've just mastered the foundation of Economic thinking. Ready for the next part?