The correct answer is: D. Quantity of the commodity demanded at a certain price during any particular period of time.
Demand is the amount of a good or service that consumers are willing and able to purchase at various prices during a given period of time. It is a schedule that shows the relationship between the price of a good and the quantity demanded of that good.
The law of demand states that, all other things being equal, the quantity demanded of a good or service will decrease as the price of that good or service increases. This is because consumers are generally willing to purchase more of a good or service when the price is lower.
There are a number of factors that can affect the demand for a good or service, including:
- The price of the good or service itself
- The prices of related goods and services
- The income of consumers
- Consumer tastes and preferences
- The expected future price of the good or service
- The number of buyers in the market
The demand for a good or service can be represented by a demand curve. A demand curve is a graph that shows the relationship between the price of a good and the quantity demanded of that good. The demand curve slopes downward, indicating that the quantity demanded of a good decreases as the price of that good increases.
The demand curve is a useful tool for businesses to use in making pricing decisions. By understanding the demand for their products, businesses can determine the optimal price to charge in order to maximize profits.