Updated for the 2026-2027 CFA® Level I curriculum.
Industry analysis starts with facts, not opinions. Before an analyst forecasts a company's future, they need to know how big the industry is, how fast it grows, how profitable it tends to be, and how market share moves between competitors.
This note covers the data and reasoning CFA Level I candidates need to build that foundation. After reviewing it, you should be able to explain how analysts measure industry size and growth, connect profitability to competitive structure, and use cyclicality and life-cycle stage to interpret trends.
Quick Answer
Analysts determine industry size using revenue, unit volume, or market value data from trade associations, government sources, and company filings.
Growth characteristics come from historical trends and forward drivers like GDP growth, demographics, and technology.
Profitability and market share trends reveal competitive intensity: stable share and high margins suggest strong barriers to entry, while shifting share and thin margins suggest fragmentation or disruption.
Cyclicality and industry life-cycle stage explain why these numbers move the way they do.
Key Takeaways About Industry Size, Growth, Profitability, and Market Share Trends
Industry size is measured using revenue, unit sales, or market value, sourced from trade groups, government data, or aggregated company financials.
Growth characteristics combine a historical growth rate with forward-looking drivers such as GDP growth, demographic shifts, and regulation.
Profitability trends (margins, ROE, ROIC) show whether an industry can sustain returns above its cost of capital.
Market share stability signals competitive intensity: stable share often means high barriers to entry, shifting share often means low barriers or disruption.
Cyclical industries have demand tied closely to the business cycle; non-cyclical industries do not.
High operating leverage and low product necessity increase an industry's sensitivity to the business cycle.
Industry life-cycle stage (embryonic, growth, shakeout, mature, decline) frames expected growth, profitability, and competitive behavior.
What You Need to Know for CFA Level I
Identify the data sources and measures analysts use to size an industry.
Distinguish historical growth from projected growth and name the drivers behind each.
Interpret profitability and market share data to judge competitive intensity and sustainability of returns.
Classify an industry as cyclical or non-cyclical and explain the underlying reason.
Match an industry's characteristics to the correct life-cycle stage.
Apply all four elements together to interpret an exam scenario, not just define them individually.
How to Determine Industry Size
Industry size answers a basic question: how much economic activity does this industry represent? Analysts typically measure it three ways.
#1 Revenue
Total sales generated by all firms in the industry over a period. This is the most common measure and the easiest to compare across time.
#2 Unit volume
Physical output, such as barrels of oil produced or vehicles sold. Useful when prices are volatile and revenue alone would distort the trend.
#3 Market value
The combined value of outstanding securities issued by industry participants. This measure reflects investor expectations, not just current sales.
Analysts gather this data from trade associations, government statistical agencies, industry research firms, and aggregated company filings. No single source is complete, so analysts often cross-check figures from more than one source before drawing conclusions.
Size alone does not tell you whether an industry is attractive. A large industry can be mature and slow-growing. A small industry can be young and expanding quickly. Size is the starting measurement, not the conclusion.
How to Assess Growth Characteristics
Growth analysis has two parts: what already happened, and what is likely to happen next.
Historical growth rate
Calculated from past revenue or unit data, usually over a multi-year period to smooth out short-term noise.
Growth drivers
Forward-looking factors that explain whether the historical rate will continue, accelerate, or slow down.
Common growth drivers include:
Macroeconomic growth. Industries tied closely to GDP grow when the broader economy grows.
Demographic trends. Population size, age structure, and urbanization shift demand for products and services.
Technology. New technology can create industries, expand existing ones, or make them obsolete.
Government policy and regulation. Subsidies, tariffs, and regulatory changes can accelerate or restrict growth.
Social and behavioral change. Shifts in consumer preference change demand patterns over time.
Candidates should compare an industry's growth rate to GDP growth. Growth consistently above GDP suggests structural expansion. Growth tracking GDP closely suggests a mature, economy-linked industry.
How to Evaluate Profitability and Market Share Trends
Profitability and market share are read together, not separately. Each one explains part of the same competitive story.
Profitability measures include gross margin, operating margin, net margin, return on equity (ROE), and return on invested capital (ROIC). Rising margins over time suggest pricing power or cost efficiency. Falling margins suggest rising competition or cost pressure.
Market share trends show how revenue or unit volume is distributed among competitors and whether that distribution is changing.
Market Share Pattern | Likely Interpretation |
|---|---|
Stable share among a few large firms | High barriers to entry, limited new competition |
Shifting share among many firms | Low barriers to entry, fragmented competition |
Share moving toward one firm | A competitive advantage is strengthening |
Share eroding for the industry leader | New entrants or substitutes are gaining ground |
An industry with stable market share and high margins usually has strong barriers to entry, such as high capital requirements, brand loyalty, or regulatory protection. An industry with shifting share and thin margins usually has low barriers and intense price competition. Level I questions often test whether you can connect these two data points to reach a conclusion about competitive structure, rather than reading each number in isolation.
How Cyclicality and Industry Life Cycle Inform Trend Analysis
Size, growth, and profitability data mean little without context. Two supporting concepts help explain why the numbers behave the way they do.
Cyclicality
A cyclical industry has demand that rises and falls with the business cycle. A non-cyclical (defensive) industry has demand that stays relatively stable regardless of economic conditions.
Factors that increase sensitivity to the business cycle:
Discretionary products. Goods and services consumers can delay or skip during downturns (autos, luxury goods, travel).
High operating leverage. High fixed costs mean profits swing sharply when sales volume changes.
Few substitutes for necessity. Products consumers must buy regardless of income (utilities, basic food) show low cyclicality.
Durable versus non-durable goods. Durable goods purchases are easier to postpone, increasing cyclical sensitivity.
Utilities and consumer staples are classic non-cyclical examples. Automobiles and capital equipment are classic cyclical examples.
Industry Life Cycle
The life-cycle model frames how growth, profitability, and competition typically change as an industry matures.
Stage | Growth | Profitability | Competitive Intensity |
|---|---|---|---|
Embryonic | Slow, from a small base | Low or negative | Few competitors, high uncertainty |
Growth | Rapid | Rising | New entrants attracted by returns |
Shakeout | Slowing | Peaks then pressured | Weaker competitors exit or merge |
Mature | Slow, GDP-like | Stable but lower than growth stage | Few large firms, stable share |
Decline | Negative or flat | Falling | Firms exit, remaining share consolidates |
An industry's life-cycle stage helps explain observed size, growth, profitability, and market share data. A mature industry showing high growth and shifting market share would be an unusual pattern worth investigating further, since it does not match the typical profile for that stage.
Worked Example
An analyst is reviewing two industries.
Industry A: Revenue grew 3% annually over the past five years, roughly matching GDP growth. Operating margins have held steady near 18%. The top four firms have controlled a combined 75% market share for over a decade.
Industry B: Revenue grew 22% annually over the past five years. Operating margins rose from 5% to 15% over the same period. Market share has shifted significantly each year, with no firm holding more than 12% of the market.
Step 1: Assess growth
Industry A grows in line with the economy. Industry B grows well above GDP, suggesting a structural expansion driver rather than a cyclical one.
Step 2: Assess profitability and share
Industry A shows stable margins and stable share, consistent with high barriers to entry. Industry B shows rising margins but volatile share, consistent with firms still competing for position.
Step 3: Apply the life-cycle lens
Industry A's pattern matches a mature industry. Industry B's pattern, rapid growth, improving profitability, and no dominant player yet, matches a growth-stage industry approaching shakeout.
Industry A is a stable, low-growth industry where competitive position rarely changes. Industry B is still expanding and consolidating, so today's market share leaders may not hold that position once the shakeout stage arrives.
Common Exam Traps
Confusing industry growth with company growth
A fast-growing industry does not guarantee that every company within it is growing. Some firms lose share even in an expanding market.
Reading profitability without checking market share
Rising margins can mean genuine competitive strength or a temporary condition before new entrants arrive. Always check whether share is stable or shifting before concluding the margin trend will hold.
Assuming all discretionary-goods industries are equally cyclical
Operating leverage matters as much as product type. A discretionary-goods firm with low fixed costs can be less cyclical than expected.
Misreading life-cycle stage from growth rate alone
High growth alone does not confirm the growth stage. Profitability trend and competitive intensity must also match before assigning a stage.
Giving a share or margin conclusion without an economic reason
Stating that "market share is shifting" is incomplete. The exam expects the reason: low barriers to entry, new substitutes, or changing demand.
Practice Question
An analyst notes the following about an industry: revenue growth has averaged 25% annually for three years, well above GDP growth. Operating margins have improved from 4% to 11%. Fifteen firms compete for market share, and the top firm holds only 9% of total revenue.
Based on this information, which life-cycle stage best describes this industry?
Mature, because margins are positive and rising
Growth, because revenue growth exceeds GDP growth and no firm has established dominant share
Decline, because fragmented market share signals falling demand
Correct Answer: B
Revenue growth well above GDP, improving profitability, and a fragmented market with no dominant firm all match the growth stage of the industry life cycle. Firms are still competing for position before consolidation occurs in the shakeout stage.
Option A: Positive and rising margins alone do not indicate maturity. Mature industries typically show stable, GDP-like growth and stable market share, not 25% annual growth.
Option C: Fragmented share reflects early competition, not falling demand. Declining industries show negative or flat growth, which contradicts the 25% growth rate given.
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FAQs About Industry Size, Growth, Profitability, and Market Share Trends
What is the difference between industry size and industry growth?
Industry size measures how large an industry is right now, using revenue, unit volume, or market value. Industry growth measures how that size is changing over time.
Why does market share stability matter for profitability analysis?
Stable market share usually indicates strong barriers to entry, which helps firms sustain margins. Shifting share usually signals competitive pressure that can erode profitability.
How do I know if an industry is cyclical without a business-cycle chart?
Check whether the products are discretionary or necessity-based, and check the industry's operating leverage. Discretionary products and high fixed costs both increase sensitivity to the business cycle.