Provide a stepwise curved arrow mechanism for the following reaction. 
Definitions:
Purely Competitive
A market structure characterized by many sellers offering identical products, leading to no single seller influencing the market price.
Market Price
The present cost at which a service or asset is available for purchase or sale in a specific market.
Decreasing-Cost Industry
An industry where production costs decrease as the industry grows, often due to economies of scale.
Long-Run Equilibrium
A state in which all factors of production and costs are variable, allowing firms to make adjustments such that supply equals demand, and no economic profits are earned.
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