There is a well-known investment philosophy, that is, "invest in a company with a moat". The general meaning is that a company can only resist the erosion of its own profit space by other competitors only if it has sufficient competitive advantages. Investors can only invest in such Only companies that can bring excess returns. However, "moats" often have traps, and the most common trap is market share. Higher market shares are often considered by investors as the company's "moat", but the practice has proven that this does not Unreliable. Market share just shows the company's past performance and does not represent the future. If there is not enough capacity to withstand foreign invasions, companies will have to maintain market share through price wars, and the result must be a significant decline in profit margins. According to this text, is the following statement correct? ['Understanding competitive advantage as one-sided.', "The market share reflects the size of the company's competitive advantage.", 'Investors should consider both profitability and market share.', 'Enterprise\'s "moat" does not guarantee investors\' excess returns.']