Long-run AS

Welcome to Long-Run Aggregate Supply (LRAS)!

In our previous look at the Short-Run (SRAS), we focused on how businesses react to changes in costs like wages or raw materials. But what happens when we look further ahead? Long-run Aggregate Supply (LRAS) is all about the "potential" of an entire country. It represents the maximum amount of goods and services an economy can produce when it's using all its resources (like workers and machines) efficiently.

Think of it like a professional athlete. Their "short-run" performance might change if they have a cold or a bad night's sleep. But their "long-run" performance is determined by their training, diet, and equipment. In this chapter, we are looking at the "training and equipment" of the UK economy!

Prerequisite check: Before we dive in, remember that Aggregate Supply simply means the total amount of everything produced in the economy at different price levels.

1. Two Ways of Looking at the Long Run

Economists don't always agree! For your Edexcel exam, you need to understand two different "shapes" for the LRAS curve. Don't worry if this seems tricky at first; they just represent two different ways of thinking about how the world works.

A) The Classical (Vertical) LRAS

The Classical (or Neo-Classical) view is that in the long run, the economy will always end up at its full capacity. They believe that if the price level rises or falls, it doesn't actually change how much we *can* produce in the long run.

The Shape: A perfectly vertical line. We label the point on the bottom axis \( Y_{fe} \) (which stands for Full Employment of resources).

Analogy: Imagine a football stadium that holds exactly 50,000 people. No matter how much you increase the price of a ticket, you can still only fit 50,000 people inside. The capacity is fixed by the physical seats available.

B) The Keynesian LRAS

John Maynard Keynes had a different idea. He argued that an economy could get "stuck" with high unemployment for a long time. His curve has three distinct parts:

1. Horizontal part: The economy has lots of spare capacity (high unemployment, empty factories). You can increase production without prices rising because there are so many unused resources.
2. The Curve: As the economy gets closer to full capacity, resources become a bit more scarce, so prices start to creep up.
3. Vertical part: The economy is now at full capacity \( Y_{fe} \). You cannot produce any more, no matter how much prices rise.

Quick Takeaway: The Classical view says we are always at the limit; the Keynesian view says we can be far below the limit if there is a recession.

2. What Shifts the LRAS Curve?

If the LRAS represents the "potential" of the country, then it only shifts if the quantity or quality of our resources changes. Shifting the LRAS to the right means the economy has grown its potential (Economic Growth).

Here are the key factors listed in your syllabus that cause these shifts:

1. Technological Advances
New inventions make us more efficient.
Example: The invention of the internet or 3D printing allows firms to produce more with the same number of workers.

2. Changes in Relative Productivity
Productivity is how much output you get per worker. If workers become better at their jobs, the LRAS shifts right.
Example: A new management technique that helps a factory floor produce 20% more cars per day.

3. Changes in Education and Skills
This is often called Human Capital. Better educated workers are more flexible and productive.
Example: The government investing in T-Levels or apprenticeships to help people learn modern engineering skills.

4. Changes in Government Regulations
Sometimes "red tape" makes it harder to produce. Removing unnecessary regulations can lower costs for all businesses, shifting LRAS right. However, some regulations are needed for safety!
Example: Simplifying the planning permission process so it is easier for companies to build new factories.

5. Demographic Changes and Migration
The size of the workforce matters. If more people enter the country or the retirement age increases, there are more hands available to work.
Example: Young, skilled migrants moving to the UK to work in the NHS or the tech sector increases the total labor supply.

6. Competition Policy
When the government forces companies to compete (by breaking up monopolies), it makes firms more efficient and innovative.
Example: Regulators making it easier for new, smaller airlines to compete with big ones, leading to more flights and better efficiency.

Memory Aid: Use the mnemonic P.E.C.T.D.R.
Productivity
Education
Competition
Technology
Demographics
Regulation

3. Summary and Tips for Success

Common Mistake Alert!

A very common mistake is shifting the LRAS because of a change in oil prices or raw material costs.
Stop! Those are Short-Run factors. They affect business costs today, but they don't change the underlying potential of the country. Only shift LRAS if the "engine" of the economy gets bigger or better.

Quick Review Box

- Classical LRAS: Vertical line, assumes the economy always reaches full capacity \( Y_{fe} \).
- Keynesian LRAS: Shows spare capacity; starts flat and then becomes vertical.
- Right Shift: Caused by more/better workers, better tech, or more efficiency.
- Left Shift: Caused by a permanent loss of resources (e.g., a natural disaster or a permanent decrease in the workforce).

Did you know?

The "Productivity Gap" is a famous problem in the UK. For many years, UK workers have produced less per hour than workers in the US, Germany, or France. This is why UK governments are so obsessed with "Investment" and "Skills"—they are trying to shift the LRAS to the right!

Final Key Takeaway: LRAS is the "limit" of the economy. To increase it, we need to work smarter (quality), work more (quantity), or use better tools (technology).