The Weighted Average Method of Estimating Expected Future Earnings is Based on the Average or Arithmetic Mean. Here’s Why that’s Important. Companies that are growing in revenue need to be valued regularly, and they need to be valued with their future growth in mind. The weighted average approach is a valuable tool. But Richard Claywell suggests caution in using it to extrapolate large projections of future revenue. Why? Partly because it’s quite often typical for fast-growing companies to experience their most dramatic growth during their early years—and it’s important to focus on current market conditions more than past or imagined…