Which revenue projection approach is generally more common and reliable, and why?

• A. Bottoms-Up, because estimating big-picture numbers is almost impossible.
• B. Tops-Down, because it starts with market size and market share.
• C. They are equally common.
• D. Neither method is used.

Answer: (A)

Bottoms-up builds revenue from concrete sales drivers, starting with expected unit volumes and price per unit and then aggregating to total revenue. This anchors the projection in what the business can actually produce and sell, making the numbers more realistic and harder to inflate with guesswork. Because of that grounding in observable activity, this approach is generally more common and reliable than starting from a large market size and assumed market share, which relies on broader, more uncertain assumptions. Top-down can be useful for quick sanity checks or scenario framing, but it tends to be less dependable as the primary forecast.