Demand is the quantity of a good that buyers are willing and able to purchase at a given price, and supply is the quantity of a good that sellers are willing and able to offer at a given price. Thus, demand is created by consumers, and supply is created by producers and sellers. Price changes typically react inversely: when prices rise, demand typically decreases and supply increases. The market price is determined at the intersection of these two factors.
To sum it up
- Who: Demand is the buyers' side, supply is the sellers' side.
- Reaction to price change: A higher price decreases the quantity demanded (law of demand) and increases the quantity supplied (law of supply).
- Schedule: The demand curve slopes downward to the right, the supply curve slopes upward; the intersection point is market equilibrium.
- Other factors: Demand is influenced by, among other things, income and tastes, while supply is influenced by production costs and technology.
What is demand?
Demand — is the quantity of a good or service that buyers are willing and able to purchase at a given price, in a given place, and at a given time. Both conditions are important: desire alone is not enough to create demand. If someone dreams of a new car but can't afford it, they're not creating demand—they're expressing a need.
Law of demand states that, all other things being equal, an increase in price leads to a decrease in quantity demanded, while a decrease in price leads to an increase in quantity demanded. On the graph (price on the vertical axis, quantity on the horizontal axis), the demand curve has a downward slope from left to right.
What is a proposal?
Offer — is the quantity of a good or service that sellers (producers) are willing and able to offer on the market at a given price, in a given place, and at a given time. Two conditions are also important here: willingness to sell and production capacity.
Law of supply The supply curve states that, all other things being equal, an increase in price increases the quantity supplied. A higher price means greater potential profit, so it is profitable for producers to produce more, and new sellers enter the market. The supply curve has an upward slope from left to right.
Comparative table of supply and demand.
| Characteristic | Demand | Supply |
|---|---|---|
| Definition | The quantity of a product that buyers are willing and able to purchase at a given price. | The quantity of a product that sellers are willing and able to sell at a given price. |
| Who creates it? | Consumers, buyers | Manufacturers, sellers |
| When the price goes up | The volume of demand is falling. | The volume of supplies is increasing. |
| When the price falls | Demand is growing. | The volume of supply is decreasing. |
| Curved shape | Fall | Ascending |
| Key non-price factors | Income, tastes, prices of substitute and related goods, expectations | Production costs, technology, number of producers, taxes and subsidies, natural conditions |
| Economic law | Law of demand | Law of supply |
What influences demand and what influences supply?
Price is only one factor. Others, the so-called non-price factors , shift the entire curve - either to the right (increase) or to the left (decrease).
Demand factors
- income – the more we earn, the more we buy of most goods;
- Prices for substitutes – when the price of butter rises, the demand for margarine also increases;
- prices for related products – if fuel prices rise, demand for larger vehicles may fall;
- Tastes and fashion ,, season;
- Expectations – the announcement of a price increase encourages people to make purchases in advance.
Supply factors
- Production costs – raw materials, energy, wages;
- Technologies – more modern equipment allows us to produce more products at a lower price;
- number of producers at the market;
- Taxes and subsidies – a tax reduces supply, a subsidy increases it;
- natural conditions – for example, weather in agriculture.
It is important to distinguish change in demand (movement along a curve caused by a change in price) and change in demand (a shift in the entire curve caused by a factor other than price). The same applies to supply. This is a common topic in social studies and entrepreneurship classes.
Market equilibrium is the point where demand meets supply.
Equilibrium price — is the price at which demand equals supply. On the graph, this is the intersection of the two curves. Buyers buy exactly what sellers are willing to sell.
- The price is above the equilibrium price → supply exceeds demand → arises excess goods. Sellers are lowering prices to sell off their inventory.
- The price is below the equilibrium price → demand exceeds supply → arises deficit . Queues form and prices rise.
A real-life example: during the peak season, large quantities of strawberries hit the market (increasing supply), which typically leads to lower prices. Before the holidays, interest in carp and Christmas trees increases (increasing demand), which leads to higher prices.
How to remember the difference between supply and demand?
- Demand is equal to the amount in the buyer's wallet. Question: How many people will buy at this price?
- Offer = seller's shelf. Question: How much will the company offer for sale at this price?
- Direction of curves: demand falls (the more expensive it is, the less I buy), supply rises (the more expensive it is, the more profitable it is to sell more).
- In the problem where you need to find the equilibrium price, Compare the demand function with the supply function and solve the equation for price.
Frequently Asked Questions (FAQ)
What happens when demand exceeds supply?
A shortage arises: buyers want to buy more than is available. Sellers can raise prices, which reduces demand and stimulates an increase in supply until the market returns to equilibrium.
What happens when supply exceeds demand?
A surplus of goods arises. Sellers lower prices, organize promotions, or limit production, and the price reduction leads to increased demand.
Does demand always decrease when price increases?
Generally yes, but there are exceptions in economics. In the case of so-called luxury goods (the Veblen effect), a high price can be an advantage, and, anticipating further price increases, people buy more despite the price increase.
What is the difference between demand and need?
A need is a perceived lack of something. Demand arises only when a need is combined with the ability to pay and the willingness to purchase a product at a certain price.
What is market equilibrium?
This is the state in which, at a given price, the quantity of a good consumers want to buy equals the quantity supplied by producers. On a graph, this is the intersection of the demand curve and the supply curve.
See also
- What is the difference between revenue and income?
- What is the difference between export and import?
- What is the difference between microeconomics and macroeconomics?
- What is the difference between margins and markup?