Understanding the Supply Curve of a Normal Good

The question asks about the characteristics of the supply curve for a normal good, specifically its slope and what is represented on the x and y axes of the graph.

In economics, a supply curve is a graphical representation showing the relationship between the price of a good or service and the quantity supplied by producers at that price, assuming all other factors remain constant. A normal good, in the context of supply, is simply a standard good where the law of supply applies.

The Slope of the Supply Curve

For most goods, including normal goods, the supply curve is upward sloping. This relationship is based on the Law of Supply.

• The Law of Supply states that, all else being equal (ceteris paribus), as the price of a good or service increases, the quantity supplied increases, and conversely, as the price decreases, the quantity supplied decreases.
• Producers are typically willing and able to supply more of a good at higher prices because higher prices can cover higher production costs (like overtime pay or using less efficient resources) and lead to greater profits.

Therefore, the first blank in the question should be filled with "upward".

Axes on the Supply Curve Graph

The standard convention for graphing supply and demand curves in economics is to place:

• Quantity (either quantity demanded or quantity supplied) on the horizontal axis (x-axis).
• Price on the vertical axis (y-axis).

This convention is widely used to depict how quantity supplied changes in response to a change in price.

Following this convention, the second blank (depicting the x-axis) should be filled with "quantity supplied", and the third blank (depicting the y-axis) should be filled with "price".

Completing the Statement

Putting it all together, the completed statement is:

The supply curve of a normal good is upward sloping. It depicts quantity supplied on the x-axis and price on the y-axis.

Analyzing the Options

Let's compare this completed statement with the given options:

Based on the analysis, Option 2 correctly identifies the upward slope, quantity supplied on the x-axis, and price on the y-axis.

Revision Table: Key Concepts

Additional Information on Supply

Understanding the supply curve involves more than just its slope and axes. Here are some related concepts:

• Movement along the Supply Curve: A change in the price of the good causes a movement along the existing supply curve, leading to a change in the quantity supplied.
• Shift of the Supply Curve: Changes in factors other than the price of the good itself (like input costs, technology, number of sellers, expectations, government policies like taxes or subsidies) can cause the entire supply curve to shift either to the left (decrease in supply) or to the right (increase in supply).
• Individual vs. Market Supply: An individual supply curve shows the quantity supplied by a single producer. The market supply curve is the horizontal summation of all individual supply curves in the market.

These concepts help to build a complete picture of how supply works in a market.