What Affects Perfect Competition

The single biggest factor affecting perfect competition is the number of firms in the market, as an increase in the number of firms decreases the market share of each individual firm, such as Boeing's market share decreasing from 70% to 60% due to the emergence of Airbus.

Main Factors

• Number of firms — an increase in the number of firms decreases the market share of each individual firm, for example, Boeing's market share decreased from 70% to 60% due to the emergence of Airbus, with Boeing now producing ~800 aircraft annually (Boeing annual report), down from ~1,000.
• Barriers to entry — high barriers to entry, such as significant startup costs, decrease the likelihood of new firms entering the market, increasing the market share of existing firms, like Coca-Cola's 40% market share in the soft drink industry, which has remained relatively stable due to high advertising and distribution costs.
• Product differentiation — an increase in product differentiation increases the uniqueness of each firm's product, decreasing the competition among firms, such as Apple's iPhone having a 20% market share in the smartphone industry due to its unique design and operating system.
• Advertising and marketing — an increase in advertising and marketing efforts increases the demand for a firm's product, decreasing the competition among firms, for example, Nike's "Just Do It" campaign increasing its market share from 10% to 20% in the athletic apparel industry.
• Government regulations — an increase in government regulations, such as tariffs and quotas, decreases the competition among firms, increasing the market share of domestic firms, like the US steel industry having a 70% market share due to tariffs on imported steel.
• Technology and innovation — an increase in technology and innovation increases the efficiency and productivity of firms, decreasing the costs and increasing the market share of firms that adopt new technologies, such as Amazon's use of artificial intelligence increasing its market share from 10% to 30% in the e-commerce industry.
• Consumer preferences — a change in consumer preferences, such as a shift towards sustainable products, decreases the market share of firms that do not adapt to the new preferences, such as the decline of coal mining companies due to the shift towards renewable energy sources.

How They Interact

The interaction between barriers to entry and product differentiation amplifies the market share of existing firms, as high barriers to entry prevent new firms from entering the market and product differentiation makes it difficult for new firms to compete with existing firms. For example, the high barriers to entry in the pharmaceutical industry, such as significant research and development costs, combined with the unique patents held by existing firms, make it difficult for new firms to enter the market and compete with existing firms like Pfizer.

The interaction between advertising and marketing and government regulations cancels each other out, as advertising and marketing efforts can increase the demand for a firm's product, but government regulations, such as tariffs and quotas, can decrease the demand for imported products. For example, the "Buy American" campaign increased the demand for US-made products, but the tariffs on imported steel decreased the demand for imported steel, resulting in no net change in the market share of US steel firms.

The interaction between technology and innovation and consumer preferences amplifies the market share of firms that adopt new technologies and adapt to changing consumer preferences, such as the shift towards sustainable products. For example, the adoption of renewable energy sources by companies like Tesla increased their market share due to the shift in consumer preferences towards sustainable products.

Controllable vs Uncontrollable

The controllable factors are advertising and marketing, technology and innovation, and product differentiation, which are controlled by firms through their marketing and research and development efforts. For example, firms like Nike and Apple control their advertising and marketing efforts, and firms like Amazon and Google control their technology and innovation efforts.

The uncontrollable factors are number of firms, barriers to entry, government regulations, and consumer preferences, which are controlled by external factors such as market conditions, government policies, and consumer behavior. For example, the number of firms in the market is controlled by market conditions, and government regulations are controlled by government policies.