Which of the following is NOT a character of perfect competition?

1. Analyze the question We are asked for the option that is NOT a characteristic of perfect competition.

2. Key concept: features of perfect competition

• Many buyers and sellers, so no single firm can influence the price (firms are price takers)
• Homogeneous (identical) products
• Perfect knowledge of market conditions (prices, costs, and so on)
• Free entry and exit of firms
• Perfect mobility of factors of production
• No need for advertising, since products are identical and buyers already know the prices

3. Check each option

• A. Supply and demand are equal. This is not a structural characteristic of the market. Supply and demand being equal is simply the equilibrium condition, and it can be reached in any market structure (monopoly, oligopoly and so on). It is also not a defining feature of perfect competition. Firms in perfect competition may face a surplus or shortage in the short run until price adjusts.
• B. Products are identical. This is a true feature (homogeneous goods).
• C. There is perfect knowledge. This is a true feature.
• D. There is no advertising. This is a true feature, because identical products and perfect knowledge make advertising pointless.

4. Answer Options B, C and D are all genuine characteristics. Option A describes market equilibrium and not a defining characteristic of perfect competition, so it is the odd one out.

5. Exam tip Remember the features of perfect competition with "HIP-FN": Homogeneous products, Information (perfect knowledge), Price taker, Free entry and exit, No advertising. If an option describes an outcome (like equilibrium) rather than a market condition, it is often the "NOT" answer.