How do prices change if there is a surplus or shortage?
General knowledgeAsked by Anonymous from Bordeaux, France24 Oct 2026, 5:40 AM ISTUpdated
In one line
If there is a surplus, prices usually fall; if there is a shortage, prices usually rise.
The rule
When the quantity of a good supplied is more than the quantity demanded (surplus), prices tend to fall. When the quantity demanded is more than the quantity supplied (shortage), prices tend to rise.
Let's understand it simply
Imagine you are at the vegetable market. If there are too many tomatoes and not enough buyers, sellers will lower the price to sell them before they spoil. This is a surplus (too much supply). Now, think of onions during a bad monsoon. If there are very few onions but many people want them, sellers can charge more. This is a shortage (not enough supply).
Surplus vs Shortage: What happens to price?
Surplus
Shortage
Meaning
More goods than buyers
More buyers than goods
Effect on price
Price falls
Price rises
Example
Tomatoes in summer
Onions after floods
How it works
When there is a surplus (more goods than buyers), sellers compete to sell their goods.
To attract buyers, sellers lower their prices.
Lower prices encourage more people to buy and some sellers to stop selling, reducing the surplus.
When there is a shortage (more buyers than goods), buyers compete to get the goods.
Sellers see many buyers and raise their prices.
Higher prices make some buyers drop out and encourage more sellers to bring goods, reducing the shortage.
How prices change with surplus or shortage
Surplus: Too much supply → sellers lower prices → buyers buy more → balance returns
Shortage: Too little supply → sellers raise prices → buyers buy less → balance returns
The story behind it
This idea comes from the basic laws of supply and demand, first clearly explained by economists like Adam Smith in the 1700s. They noticed that prices in markets change based on how much of a good is available and how many people want it. The famous example is the price of bread in England, which would rise after a bad wheat harvest (shortage) and fall after a bumper crop (surplus).
Where you see it in real life
Tomato prices in summer: Too many tomatoes → prices drop → farmers may not cover costs.
Onion prices after floods: Few onions → prices rise → people buy less or switch to other vegetables.
Diwali crackers after a ban: Not enough crackers → prices go up → only a few can afford.
Mobile phones after a new launch: Limited stock, high demand → prices are high in the first week.
Mangoes in off-season: Very few mangoes → high price → only some people buy.
Why it matters
Helps farmers and shopkeepers decide when to sell or store goods.
Affects what you and your family can afford to buy in the market.
Important for government policies (like controlling onion prices).
Forms the base for more advanced economics topics (like market equilibrium and price controls).
Common mistakes
Thinking prices always stay the same, even if there is a surplus or shortage. (In reality, prices change to balance supply and demand.)
Believing that only sellers set prices. (Buyers and sellers both affect prices.)
Mixing up surplus (too much supply) and shortage (too little supply).
Remember it
Surplus makes prices sink, shortage makes prices soar.
Check yourself
What usually happens to the price of onions if there is a shortage?
The price rises because more people want onions than are available.
Why do sellers lower prices when there is a surplus?
To attract buyers and sell their extra goods before they spoil or lose value.
If there are too many buyers and not enough goods, what is this called?
A shortage.
Give one example from your life where you saw prices rise because of a shortage.
(Student's own example, e.g., LPG cylinder prices rising during a strike.)
Quick recap
Surplus means more goods than buyers; prices fall.
Shortage means more buyers than goods; prices rise.
