Why is market size included in a startup pitch deck?

• A. It signals potential scale and total addressable opportunity.
• B. It defines the exact market share the startup will capture immediately.
• C. It is used to determine immediate profitability.
• D. It outlines the company's internal costing structure.

Answer: (A)

Understanding market size in a startup pitch deck focuses on showing the potential scale of the opportunity. It communicates the total addressable market—the overall demand if you could capture 100%—and, more realistically, the portion you could reach over time. This framing helps investors see how big the prize could be and why the business could grow substantially with the right strategy and funding.

Because of that, the market-size figure signals potential scale and the total addressable opportunity, which is what investors care about when evaluating a startup’s growth trajectory. It’s not a claim about immediately capturing a fixed market share, nor is it about current profitability or internal costing. Those aspects depend on execution, competition, and operations, whereas market size reflects the upside and the reason to invest.