Define Competitive Strategy
Long-term action plan that is devised to help a company gain a competitive advantage over its rival. This type of strategy is often used in advertising campaigns by somehow discrediting the competition's product or service. Competitive strategies are essential to companies competing in markets that are heavily saturated with alternatives for consumers.
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Assuming your question was related to government competitions, FAR 7.105 describes elements to consider when building an acquisition strategy. A strategy for your specific competition depends heavily on what you are buying and what the market tells you is available from a product/service and potential offerors.