When we move along a given supply curve,
O only price is held constant.
O technology and price are held constant.
O all nonprice determinants of supply are held constant.
O all determinants of quantity supplied are held constant.
The Correct Answer and Explanation is:
Correct Answer: ✅ All nonprice determinants of supply are held constant.
When we move along a given supply curve, the correct economic assumption is that all nonprice determinants of supply are held constant. This concept is central to understanding how supply behaves in response to price changes alone.
The supply curve graphically shows the relationship between the price of a good or service and the quantity that producers are willing to supply over a given period of time. When we move along the supply curve, we are examining how quantity supplied changes in response to price changes only—not due to any other external factors.
To isolate the effect of price, economists hold all other variables constant. These variables are called nonprice determinants of supply. They include:
- Technology: Advances or regressions in technology can make production more or less efficient.
- Input prices: Changes in the costs of raw materials, labor, or other inputs can shift the entire supply curve.
- Number of sellers: More sellers usually increase supply, while fewer sellers reduce it.
- Taxes and subsidies: These can either encourage or discourage production.
- Producer expectations: Future price expectations can affect current supply.
- Prices of related goods in production: For example, a farmer choosing between growing wheat or corn.
If any of these nonprice factors change, the entire supply curve shifts (either to the left for a decrease in supply or to the right for an increase). However, when we move along the supply curve, it means we are analyzing how quantity supplied responds to a change in price, assuming all those other factors remain unchanged.
In short, movement along the curve = price change only, while a shift of the curve = change in nonprice determinants. Understanding this distinction is crucial for interpreting supply behavior correctly in economic models.