The amount of a good or service available in a market at a given price is known as "supply."
To understand why this is the correct answer, let’s clarify each option:
1. Demand: Demand refers to the quantity of a good or service that consumers are willing and able to purchase at various prices during a certain period.
2. Supply: Supply is the quantity of a good or service that producers are willing and able to sell at various prices over a specific period.
3. Quantity: Quantity, in this context, does not specify whether it refers to what is being supplied or demanded. It’s a more generic term.
4. Production: Production is the process of creating goods and services, but it doesn’t specify the amount available in the market.
Since the question asks for the amount of a good or service available in a market at a given price, it directly refers to "supply." Thus, the correct answer is supply.
