Predicting a company's top line growth is arguably the most important part of determining its stock growth. Unfortunately, unless you are a company insider with accurate order and shipment data, it's awfully difficult to know precisely how many products a company will sell in, say, the next five years. However, by working through a few key questions, investors can improve the accuracy of their guesswork: How quickly is the market for the company's products growing? What is the company's share of the market? Is the company likely to win or lose market share?

SEE: The Basics Of Business Forecasting

Market Growth
Take some time to examine the market growth rate. Is the company doing business in a mature market or a growth market? Let's say you are trying to gauge the future growth of consumer product giant Proctor & Gamble. It's worth remembering that the market for P&G's goods is fairly mature, which means that it probably won't be growing much faster than the overall economy or the GDP.

Players in the technology industry typically operate in faster growth markets. Take, for example, Apple. Less than a decade ago, Apple was known only for computers, but now it has an authoritative grasp on the phone and tablet market. To get a sense of their prospects, you need to estimate the percentage of people who already have smartphones, the percentage of new smartphone buyers and the percentage of customers who Apple may be able to grab from competitors in the years to come.

Market Share
A company's market share can also have a big impact on its future sales growth. Does the firm - like the computer chip giant, Intel - dominate its market? It's hard for Intel to grow sales by, say, 10% a year, when its annual sales are already over $50 billion and it owns 80% of the chip market. For some dominant players, there is only so much room for growing sales via gains in market share.

Other times, major market players use already strong market positions to make even more gains. Coffee-retailer Starbucks and automaker Honda are good examples of companies that have used their brand power to grow market share consistently over the years.

"Up-and-comers" can very quickly take large market share percentages from those companies that were traditionally dominant competitors. Think of Southwest Airlines. Thanks to an innovative, low-cost business model, in just a few years Southwest grabbed a big chunk of the airline business from industry leaders such as American Airlines and United Airlines.

Some companies are constantly "trading" market share with competitors. If you are considering sales growth at Coca-Cola, you may want to estimate growth from gains in market share. However, when market share swings back and forth between rivals, say Coca-Cola and Pepsi, you shouldn't put too much weight in share gains when estimating future sales growth trends.

SEE: 3 Secrets Of Successful Companies

Pricing
Pricing of products and services can have a big impact on sales revenue growth. If a company increases its prices and manages to maintain unit sales volume, then sales revenue will grow. On the other hand, higher prices can lead to fewer units sold if customers turn to less expensive alternatives.

The effect of prices on sales revenue all depends on the company's pricing power. Pharmaceutical companies, for instance, have enormous pricing power when their drugs are under patent. The same goes for companies with a lot of brand recognition and customer loyalty. Starbucks and Honda can charge higher prices than their competitors and still maintain sales revenue growth. By contrast, in technology and consumer electronics markets, it's almost inevitable that prices will fall. For companies like Sony and Intel, pricing pressure over time can be so strong that sales revenue may fall even when units sold rises.

Finally, don't forget to think about the product mix. Let's say General Motors decided it was going to focus on selling its high-end Cadillac cars over its lower-end Chevrolets. The higher average selling price of the luxury cars could end up having a favorable impact on sales growth - assuming that GM's focus on the high-end doesn't translate into fewer total cars sold.

The Bottom Line
For investors looking at a company from the outside, forecasting sales growth rates - even in the near term - is a bit like looking through the fog. These simple questions about market growth, market share and pricing power are just a start, but they can get investors a long way through the process.

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