The figure below depicts the short-run market equilibrium in a perfectly competitive market and the cost curves for a representative firm in that market. Assume that all firms in this market have identical cost curves. 
The long-run market equilibrium quantity in this industry is:
Definitions:
Industrial Society
An industrial society is characterized by the extensive use of industries and machinery for the production of goods and services, leading to significant social and economic changes.
Large Cities
Urban areas with substantial populations, typically featuring a high density of development and complex social, economic, and infrastructure systems.
Agricultural Society
A community chiefly engaged in the production of food through agriculture, emphasizing the importance of farming and cultivation in its economy and culture.
D.G.REGINA
Latin for "By the Grace of the Queen," seen on British and Commonwealth coins, symbolizing the monarch's authority.
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