There may be insuficient profits for investment.
Also there can be an unequal distribution of goods and income.
Pollution is yet another key factor. But that depends on the ideas and beliefs of a company / you as a consumer.
Perfectly competitive firms would not advertise as advertising would serve no purpose. A market that is perfectly competitive exists only in theory.
It would be a price taker
A perfectly competitive firm would set its prices at a perfectly competitive price.
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!
Because if it set its price higher than the current market price, it would not sell anything; and if it set its price lower than the current price, it would sell all of its product, but it would not make an economic profit. Understand, however, that this does not happen in real life, because in real life, there is no such thing as a perfectly competitive market.
Deadweight loss in a market can be determined by comparing the quantity of goods or services that are actually traded to the quantity that would be traded in a perfectly competitive market. This difference represents the loss of economic efficiency due to market distortions such as taxes, subsidies, or monopolies. The deadweight loss is the area of the triangle between the supply and demand curves, up to the point where they intersect in a perfectly competitive market.
In a perfectly competitive market, a monopoly would produce at a level where marginal cost equals marginal revenue, but unlike in perfect competition, it would restrict output to maximize profits. This results in higher prices and lower quantities than would occur in a competitive market, where many firms produce the same product and prices are driven down to marginal cost. Consequently, a monopoly typically leads to inefficiencies and a welfare loss in the economy, as consumer surplus is reduced and producer surplus increases.
If a perfectly competitive market stopped dealing in commodities, it would fundamentally alter its structure, as commodities are essential for maintaining standardization and equal access among buyers and sellers. The market would likely shift towards trading differentiated products or services, leading to variations in pricing and potentially reducing the level of competition. Over time, this could result in the emergence of monopolistic or oligopolistic behaviors, as firms gain the ability to influence prices and market dynamics. Ultimately, the efficiency and equilibrium characteristic of perfect competition would be compromised.
A perfectly competitive firm is a price taker because it operates in a market with many buyers and sellers, where no single firm can influence the market price due to the homogeneity of the products offered. Additionally, the presence of perfect information allows consumers to easily compare prices, leading firms to accept the market price determined by supply and demand. Since firms in this market structure produce identical products, they must sell at the prevailing market price to remain competitive, as charging a higher price would result in losing customers to competitors.
The concept of perfect competition is based on a large number of small firms, where no single firm can affect the market price. These firms operate as price takers, and use the cost supplied by the market. These ideal companies would insure efficiency. However, perfect competitive firms are unrealistic in real world scenarios.
Deadweight loss in a market can be found by calculating the difference between the quantity of goods or services that would be produced and consumed in a perfectly competitive market, and the actual quantity produced and consumed in a market with market imperfections such as monopolies or externalities. This loss represents the inefficiency and welfare loss in the market.
A purely competitive seller operates in a perfectly competitive market where many sellers offer identical or very similar products. These sellers have no control over the market price and must accept the prevailing price determined by supply and demand. They focus on efficiency and cost management to remain profitable, as any attempt to raise prices would drive customers to competitors. In this environment, the individual seller's actions have no impact on the overall market.