Welcome to the World of Markets!
In this chapter, we are going to dive into the heart of business: The Market. We’ll explore why prices change, how customers react when they get a pay rise, and why some products (like bread) sell no matter what the price is, while others (like designer handbags) are much more sensitive. Understanding these "invisible forces" helps businesses make smart decisions about what to sell and how much to charge. Don't worry if it seems like a lot of graphs at first—we’ll break it down step-by-step!
1.2.1 Demand: What do customers want?
Demand isn't just "wanting" something. In business, we call it Effective Demand. This means a consumer is both willing and able to buy a product at a certain price. If you want a private jet but don't have the money, that's not demand!
Factors that Change Demand
A "change in demand" means the whole demand curve shifts. Think of it as people wanting more or less of something, even if the price stays the same. Here is what causes it:
• Price of Substitutes: These are "rival" goods. If the price of Pepsi goes up, demand for Coke will likely increase because people switch to the cheaper option.
• Price of Complementary Goods: These are goods that go together, like Printers and Ink. If printers become very expensive, demand for ink will fall because fewer people are buying printers.
• Changes in Consumer Incomes: Generally, when people earn more, they buy more (unless it’s a "cheap" brand).
• Fashions, Tastes, and Preferences: If a celebrity wears a certain brand, demand skyrockets overnight!
• Advertising and Branding: Successful ads make people feel they "need" a product, increasing demand.
• Demographics: An aging population might increase demand for healthcare and retirement homes.
• External Shocks: Think of things like pandemics, wars, or extreme weather.
• Seasonality: Demand for ice cream goes up in summer; demand for thick coats goes up in winter.
Quick Review: Demand is about the Customer. If something makes the product more "attractive" or the customer "richer," demand usually goes up!
Key Takeaway: Demand shifts are caused by things other than the price of the product itself (like trends, income, and rivals).
1.2.2 Supply: What are businesses willing to sell?
Supply is the amount of a good or service that producers are willing and able to provide at a given price. While customers want low prices, businesses usually want high prices to make more profit!
Factors that Change Supply
A "change in supply" happens when a business decides to produce more or less at every price level. Key factors include:
• Changes in Costs of Production: If the price of raw materials (like flour for a baker) goes up, the baker makes less profit, so they supply less.
• Introduction of New Technology: Faster machines or better software make production cheaper and quicker, increasing supply.
• Indirect Taxes: These are taxes on spending (like VAT). They act like an extra cost for the business, so supply decreases.
• Government Subsidies: This is "free money" from the government to encourage production. This lowers costs and increases supply.
• External Shocks: A flood might destroy crops, suddenly decreasing the supply of wheat.
Memory Aid: Think of PINTS for Supply factors: Productivity, Indirect Taxes, Number of firms, Technology, Subsidies.
Key Takeaway: Supply is all about Costs. If it’s cheaper or easier to make, supply goes up. If it's more expensive, supply goes down.
1.2.3 Interaction of Supply and Demand
When we put the Demand curve (sloping down) and the Supply curve (sloping up) together, they cross at a point called Equilibrium. This is the "magic" price where the amount customers want to buy exactly matches the amount businesses want to sell.
How Prices Change
1. If Demand increases (shifts right), there is a shortage. Businesses can raise prices. Result: Price rises.
2. If Demand decreases (shifts left), there is a surplus. Businesses must lower prices to sell stock. Result: Price falls.
3. If Supply increases (shifts right), there is too much stock. Result: Price falls.
4. If Supply decreases (shifts left), the item becomes rare. Result: Price rises.
Real-world Example: Think of a new PlayStation launch. Demand is huge, but supply is low. This leads to a very high market price (and people selling them for double on eBay!).
Key Takeaway: The market price is a balance. If things get popular, price goes up. If things get easier to make, price usually goes down.
1.2.4 Price Elasticity of Demand (PED)
PED measures how "sensitive" customers are to a change in price. If a shop raises the price of chocolate by 10p, will everyone stop buying it, or will they barely notice?
The Formula
\( PED = \frac{\% \Delta \text{ in Quantity Demanded}}{\% \Delta \text{ in Price}} \)
(Note: \(\% \Delta\) means "percentage change")
Interpreting the Numbers
• Inelastic Demand (Value between 0 and 1): Customers are not sensitive. If the price goes up, they still buy it (e.g., Petrol, Cigarettes, Tap Water).
• Elastic Demand (Value greater than 1): Customers are very sensitive. If the price goes up a little, they run away to a competitor (e.g., specific brands of biscuits, luxury holidays).
Significance for Total Revenue
Businesses use PED to decide whether to change prices:
• If demand is Inelastic: Raising the price will increase total revenue (because people keep buying).
• If demand is Elastic: Raising the price will decrease total revenue (because too many people stop buying).
Did you know? Strong Branding makes a product more Inelastic. Apple fans will often pay almost any price for the new iPhone because they don't want a "substitute" Android phone.
Key Takeaway: PED tells a business if they can get away with a price hike. Inelastic = Yes; Elastic = No.
1.2.5 Income Elasticity of Demand (YED)
YED measures how much demand changes when a consumer's income changes. When you get a promotion and a pay rise, do you buy more steak or more 20p instant noodles?
The Formula
\( YED = \frac{\% \Delta \text{ in Quantity Demanded}}{\% \Delta \text{ in Income}} \)
Interpreting the Numbers
• Normal Goods (Positive YED): As income goes up, demand goes up. Most things are normal goods (e.g., iPhones, clothes, cars).
• Luxury Goods (Positive YED > 1): Demand goes up a lot when income rises (e.g., Designer bags, fine dining).
• Inferior Goods (Negative YED): As income goes up, demand falls. Why? Because you can now afford something better! (e.g., supermarket own-brand "value" bread, bus travel vs. owning a car).
Why this matters to businesses
• In a Boom (economy growing, everyone getting richer), businesses selling Luxury goods do very well.
• In a Recession (economy shrinking, people losing jobs), businesses selling Inferior goods (like Aldi or Poundland) often see their sales go up.
Quick Review Box:
PED = Price sensitivity.
YED = Income sensitivity.
Negative YED = Inferior Good (People ditch it when they get rich!).
Key Takeaway: Businesses need to know if their products are "recession-proof" (Inferior) or "wealth-dependent" (Luxury).
Don't worry if the formulas feel tricky—just remember that "Elasticity" is just a fancy word for "Responsiveness." You're just measuring how much one thing reacts when another thing moves!