Explain the supply function and its important determinants.

Question

Accepted Answer

The **supply function** expresses the quantity supplied of a commodity $x$ as depending jointly on several variables:
$$Q_{sx} = f(P_x,\ C,\ T_e,\ P_r,\ G,\ E,\ N)$$

1. **Price of the commodity itself ($P_x$)** — the primary determinant; by the Law of Supply, quantity supplied normally moves directly with $P_x$.
2. **Cost of production ($C$)** — a fall in the cost of inputs (raw material, labour, capital) makes it more profitable to supply more at the same price; a cost rise has the opposite effect.
3. **State of technology ($T_e$)** — better technology lowers unit cost and/or raises output capacity, raising supply at every price.
4. **Price of related goods ($P_r$)** — a rise in the price of an alternative good produced using the same resources can draw resources away, reducing this commodity's supply even though its own price is unchanged.
5. **Government policy ($G$)** — a tax raises the effective cost of supply (reduces it); a subsidy lowers it (raises supply).
6. **Expectations ($E$)** — sellers expecting a future price rise may hold back supply today; expecting a fall, they may release more today.
7. **Number of sellers ($N$)** — more firms in the industry raises market supply at every price.

When the supply schedule or supply curve is drawn to study the effect of $P_x$ alone, every other determinant in this list is held constant (ceteris paribus).

> [!ANSWER]
> The supply function's determinants are: own price, cost of production, technology, price of related goods, government policy, sellers' expectations, and number of sellers — captured as $Q_{sx}=f(P_x,C,T_e,P_r,G,E,N)$.

Period	Nature of factors
Market period	Supply is fixed; no factor can be varied
Short period	Only variable factors (labour, raw material) can change; fixed factors stay constant
Long period	All factors, including plant and machinery, are variable

Q.Explain the supply function and its important determinants.

Concept understanding — Meaning of Supply, Stock and the Supply Function

Q.Explain the supply function and its important determinants.

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