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what about them?

profits are 0

price=marginal cost

all costs are variable

optimal allocation of inputs is where marginal rate of technical substitution is equal to the price ratio of the inputs.

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What factors determine the equilibrium price and quantity for a perfectly competitive firm in the long run?

In the long run, the equilibrium price and quantity for a perfectly competitive firm are determined by factors such as production costs, market demand, and competition from other firms. The firm will adjust its output level until it reaches a point where marginal cost equals marginal revenue, resulting in an equilibrium price and quantity.


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A perfectly competitive firm ensures its profitability in the long run by maximizing efficiency, minimizing costs, and continuously adapting to market conditions to maintain a competitive edge. This includes optimizing production processes, pricing strategies, and staying responsive to changes in demand and competition.


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Monopolistically competitive firms are not considered to be perfectly efficient in the long run. This is because they have some degree of market power due to product differentiation, which can lead to higher prices and lower output compared to perfectly competitive markets.


Why will a perfectly competitive firm not earn an economic profit in the long run?

A perfectly competitive firm will not earn an economic profit in the long run because in a perfectly competitive market, there are many firms selling identical products, leading to price competition. This competition drives prices down to the point where firms only earn enough revenue to cover their costs, resulting in zero economic profit.


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In perfectly competitive markets, economic profits are zero in the long run because firms are able to enter and exit the market. If firms in a perfectly competitive market are profitable, there would be an incentive for new firms to enter. Supply would increase, causing an increase in quantity and the price to be driven back down to equilibrium: NO PROFIT! If firms in a perfectly competitive market are suffering a loss, some firms would choose to exit the market. Supply would decrease, causing a decrease in quantity and the price to be driven back up to equilibrium: NO PROFIT!


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Perfectly competitive firms earn profit in the long run by producing goods and services at the lowest possible cost and selling them at a price determined by market forces. In the long run, firms can adjust their production levels and costs to achieve equilibrium where price equals marginal cost, allowing them to earn normal profits.


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In a perfectly competitive market an increase in demand will in the long run generally cause?

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