Economic Concepts of Demand

Complementary Demand

  • Definition: Complementary demand occurs when two goods are demanded together.

    • Example: A pen and ink are complementary products; if there is demand for pens, it is likely that there will also be a demand for ink.

  • Effect of Complementary Demand:

    • When there is a change in the demand for one complementary good, it affects the demand for the other good.

    • Illustration: If the demand for pens increases, the demand for ink will also increase, as they are used together.

Competitive Demand

  • Definition: Competitive demand refers to situations where two or more goods serve the same purpose and can be used in place of one another.

    • Examples:

    • Fish and meat, both serve as protein sources; if the price of fish decreases, consumers might opt for fish instead of meat, demonstrating competitive demand.

    • Clubs and bars serve the same social purpose; if one becomes more popular (lower price or better promotion), the other may see a decrease in demand.

  • Derived Effect of Competitive Demand:

    • A fall in the price of one good results in an increase in the quantity demanded of that good, leading to a decrease in the quantity demanded of the competing good.

    • Example Scenario: If the price of fish falls, more consumers will buy fish, leading to a drop in meat sales, showcasing the interrelation of competitive demands.

Derived Demand

  • Definition: Derived demand exists when the demand for a good is driven not by its own consumption but by its need for the production of another good.

    • Examples include:

    • The demand for labor (workers) exists because it is necessary for producing goods and services such as automobiles or food products.

    • In a manufacturing context, steel is demanded to produce cars; hence the demand for steel derives from the demand for cars.

  • Effect of Derived Demand:

    • All factors of production have a derived demand.

    • Example: If the demand for cars increases, the demand for steel (a derived demand) will also increase as it is a necessary component in car manufacturing.