2.4 Supply

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📖 Main Content

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2.4.1 — Definition of Supply

What is supply?

Supply is the willingness and ability of producers (sellers) to sell goods and services at various prices over a period of time.

Two words are important here:

• Willingness — the producer wants to sell the product
• Ability — the producer can sell the product (they have the resources to make it)

Both must be present. A farmer who wants to sell crops but has no seeds to grow them cannot supply. A factory that can make cars but does not want to sell at the current price is also not supplying.

Supply is mainly associated with producers — the businesses and firms that make goods and services.

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The Law of Supply

The Law of Supply states:

The phrase ceteris paribus is Latin — it simply means "all other things being equal" or "assuming nothing else changes." Economists use this phrase a lot when they want to study the effect of one thing at a time.

In simple terms:

• Price goes UP → Quantity Supplied goes UP ✅
• Price goes DOWN → Quantity Supplied goes DOWN ✅

Why does this happen?

When prices rise, producers can earn higher profits by selling more units. This motivates them to produce and supply more. For example, if the price of mangoes rises from $1 to $3 each, mango farmers will want to grow and sell as many mangoes as possible to make more money.

This means price and quantity supplied have a direct (positive) relationship — they move in the same direction.