How does demand affect price along with competition?

In one line

The rule

The price of a good or service is affected by demand (how much people want it) and competition (how many sellers are offering it).

The basic formula from your book is: P = D - S where P = Price, D = Demand, S = Supply

But when we add competition, we must also think about how many sellers are fighting for buyers.

Let's understand it simply

Imagine you are at a cricket match. There is only one chaiwala (tea seller). Many people want tea (high demand), but only one person is selling. He can charge a high price because people have no choice.

Now, imagine there are five chaiwalas. They all want to sell their tea. If one chaiwala charges too much, people will buy from another. So, even if demand is high, the price cannot go too high because sellers compete to attract buyers.

How it works

1. Demand increases: More people want the product (like rice during a festival).
2. Price rises: Sellers see many buyers, so they raise the price to earn more.
3. Competition steps in: If there are many sellers, each tries to attract buyers by offering a lower price or better quality.
4. Price adjusts: The price may not rise much, or may even fall, if competition is strong.
5. Balance is found: The final price depends on both demand and how much competition exists.

The story behind it

The idea that demand affects price is very old. Adam Smith, an economist from Scotland, wrote about it in the 1700s. Later, economists noticed that when there are many sellers, prices do not rise as much, even if demand is high. This is because sellers compete for customers. In India, you can see this in the market every day—like during Diwali when everyone wants sweets, but there are many sweet shops.

Where you see it in real life

• Vegetable market: During the monsoon, if onions are scarce and everyone wants them, the price shoots up. But if many vendors are selling, they compete, and the price may not rise as much.
• Mobile phones: When a new phone launches, demand is high. If only one company sells it, price is high. But with many brands (competition), prices stay reasonable.
• Bus tickets during holidays: If only one bus company runs, tickets are expensive. If many companies run buses, they compete, and prices are lower.
• Online shopping: Many sellers offer the same product. Even if demand is high (like during a sale), competition keeps prices in check.
• Local kirana shops: If only one shop is in your area, prices can be high. If two or three shops are nearby, they keep prices low to attract you.
• School canteen: If only one canteen sells samosas, price is high. If two canteens compete, price is lower.

Why it matters

• Helps you make smart choices: Knowing how demand and competition affect price helps you shop wisely.
• Important for business: Shopkeepers and companies use this knowledge to set prices and attract customers.
• Used in exams and higher studies: Economics, business studies, and even government jobs test this idea.
• Affects your daily life: From buying vegetables to booking tickets, you see this everywhere.

Worked example

Let's say during Diwali, 100 people want to buy laddus, but only 50 boxes are available, and there are two sweet shops.

Given: Demand (D) = 100 boxes, Supply (S) = 50 boxes, Competition = 2 shops
Step 1: Write the rule        P = D - S
Step 2: Put in the numbers    P = 100 - 50
Step 3: Answer                P = 50 (shows high pressure on price)
Step 4: But with 2 shops, each tries to attract buyers, so they may offer discounts or better quality
Step 5: Final price is high, but not as high as if only 1 shop existed

Common mistakes

• Thinking only demand matters: Many students forget that competition can keep prices low, even when demand is high.
• Ignoring supply: Price depends on both demand and how much is available (supply).
• Assuming more sellers always means lower prices: If demand is much higher than supply, prices can still rise, but not as much as with no competition.
• Believing competition always helps buyers: Sometimes, sellers can secretly agree to keep prices high (cartel), so competition does not always lower prices.

Remember it

When demand goes up, price rises—unless competition steps in to keep it down.