Welcome to Income Distribution and Welfare!
In our previous chapters, we looked at how economies grow (making the "economic pie" bigger). Now, we are going to look at how that pie is sliced and shared among the people living in the economy. This is what economists call income distribution.
Don't worry if this seems a bit abstract at first. We’ll use simple analogies—like bathtubs and taps—to make sure everything clicks. Understanding this is vital because it explains why some people live in luxury while others struggle to meet their basic needs, and what governments can do about it.
1. The Difference Between Income and Wealth
Many people use these words to mean the same thing, but in Economics, they are very different! Understanding the difference is your first step to mastering this chapter.
Income (The Flow)
Income is a flow of money going to a factor of production over a period of time. Think of it like water coming out of a tap. Examples include wages from a job, interest from savings, or rent from a property you own.
Wealth (The Stock)
Wealth is a stock of valuable assets owned at a particular point in time. Think of this as the water sitting in the bathtub. Examples include owning a house, having a pension fund, or owning shares in a company.
Example: Imagine you earn £500 a week from a part-time job—that is your income. If you have £2,000 saved in a bank account and a car worth £3,000, your wealth is £5,000.
Quick Review:
• Income = Money earned over time (Weekly/Monthly/Yearly).
• Wealth = Value of things you own right now.
Key Takeaway: Wealth inequality is usually much "wider" than income inequality because wealth can be built up over generations and generates its own income!
2. Measuring Inequality: The Lorenz Curve
To see how unequal a country is, we use a special diagram called the Lorenz Curve. It shows the cumulative percentage of the population against the cumulative percentage of income they receive.
How to read the diagram:
1. The Line of Perfect Equality: This is a 45-degree diagonal line. If a country is on this line, it means the bottom 20% of people earn exactly 20% of the total income. Complete fairness!
2. The Lorenz Curve: This is the actual curve that "bows" beneath the diagonal line. The further the curve is from the 45-degree line, the more inequality there is in that country.
Step-by-Step Explanation:
Imagine a room of 100 people. If the Lorenz Curve is very "deep" or "saggy," it means that the first 90 people might only have 10% of the money between them, while the last 10 people hold the other 90%.
Common Mistake to Avoid: Don't forget to label your axes correctly! The horizontal axis is "Cumulative % of Population" and the vertical axis is "Cumulative % of Income."
3. The Gini Coefficient
The Gini Coefficient is a single number that summarizes the inequality shown in the Lorenz Curve. It’s a great way for economists to compare different countries quickly.
Using the Lorenz Curve diagram, imagine the area between the 45-degree line and the curve is Area A. The area underneath the curve is Area B.
The formula is: \( Gini = \frac{A}{A+B} \)
What the numbers mean:
• A coefficient of 0 means perfect equality (everyone has the same income).
• A coefficient of 1 (or 100%) means perfect inequality (one single person has all the money).
Did you know? Most developed countries have a Gini coefficient between 0.25 and 0.45. If the number is rising, it means the gap between the rich and the poor is getting wider.
Key Takeaway: Big Gap = Big Gini = Big Inequality.
4. Understanding Poverty: Absolute vs. Relative
Economists divide poverty into two main types. This is a common exam topic, so make sure you can distinguish between them!
Absolute Poverty
This is when a person does not have enough income to afford basic human needs, such as clean water, food, shelter, and clothing. The World Bank currently sets this at living on less than $2.15 a day.
Relative Poverty
This is defined in relation to the rest of the society. In the UK and EU, you are usually considered to be in relative poverty if your household income is less than 60% of the median income of that country.
Analogy: If everyone in your town owns a private jet and you only own a Ford Fiesta, you are relatively poor compared to them, even though you aren't in absolute poverty because you can still eat and stay warm.
Quick Review Box:
• Absolute: Can you survive? (Fixed threshold).
• Relative: How do you compare to your neighbors? (Changing threshold).
5. Causes and Consequences of Inequality
Why does inequality happen, and why does the government care? Here is a breakdown of the evaluation points you might need for an essay.
Causes of Inequality:
• Education and Skills: People with "high-value" skills or degrees usually earn much higher wages.
• Wealth Inheritance: Wealthy parents pass on assets to children, giving them a "head start."
• Age: Older workers often have more experience and higher pay than young people starting out.
• State Benefits: If a government cuts unemployment benefits, the gap between the working and non-working population grows.
Consequences (Why it matters):
• Social Friction: High inequality can lead to crime, social unrest, and a lack of trust in the government.
• Wasted Talent: If people in poverty can't afford education, the economy loses out on potential doctors, engineers, or entrepreneurs.
• Incentives (The Positive Side): Some economists argue that some inequality is good because it encourages people to work harder and take risks to earn more money.
Key Takeaway: Government policy aims for a "more even" distribution, but rarely "perfect" equality, as they want to keep people motivated to work.
Summary Checklist
Before you move on, make sure you can:
1. Explain the difference between income (flow) and wealth (stock).
2. Draw a Lorenz Curve and explain what the 45-degree line represents.
3. State what a Gini Coefficient of 0 and 1 means.
4. Define Absolute Poverty and Relative Poverty.
5. List two reasons why a government might want to reduce inequality.
Great job! This chapter is all about fairness and how we measure it. Keep practicing those diagrams!