A portfolio consists of the following securities. What is the portfolio weight of stock X? 
Definitions:
Long-Run Equilibrium
A state in economics where all factors of production are fully adjustable, leading to a situation where no economic agent has an incentive to change its behavior.
Monopolistic Competition
A marketplace setup in which a wide range of companies vend products that are comparable but not clones, enabling some level of market sway.
Profit Maximization
The process by which a firm determines the price and output level that returns the greatest profit.
Marginal Revenue
The additional income generated from the sale of an additional product unit, emphasizing its role in determining optimal production levels.
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