A substitute is a different product that does the same job: video-conferencing for the business flight, UPI for the card swipe, streaming for the multiplex ticket, plastic for glass, a generic molecule for a branded pill after patent expiry. Substitutes rarely kill an industry outright. They cap its price and skim its growth from outside the market-share table everyone stares at.
How do you judge the threat of substitutes?
The question has a static part and a dynamic part, and most of the analytical value comes from the dynamic part:
- Static first. What's the substitute's price-performance today, and what does switching to it cost? A substitute that's 30% cheaper but demands new habits, hardware or risk may sit inert for years.
- Then dynamic, which means the trajectory. Is the substitute's price-performance improving faster than the industry's? Everything turns on that question. Think of solar's levelized cost falling ~80 to 90% in a decade against flat thermal-coal economics. Or data tariffs collapsing against SMS pricing. Or a streaming subscription's cost per viewing-hour falling as libraries deepen, while multiplex ticket + F&B prices rise every year. When the curves are converging, date the crossover and assume the cap tightens every year after. When they're diverging, the substitute is a background nuisance.
Also check who feels it first. Substitution hits the price-sensitive, low-switching-cost cohort first: leisure travelers before contracted corporate accounts, SMS before enterprise messaging. You can see cohort-level erosion in the numbers years before the headline share moves.
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What evidence shows the threat of substitutes?
Substitute evidence comes from these sources.
| Evidence | Source | What it tells you |
|---|---|---|
| Substitute's price per unit of the job over time (₹/GB, $/MWh, cost per viewing-hour, MDR per transaction) | regulator data, industry decks, your own arithmetic | The trajectory, which is the whole game |
| Industry's own real price trend | ARs, regulator price indices | Whether the cap is already binding |
| Penetration/adoption curves of the substitute | TRAI/NPCI/DGCA-type data, substitute's own filings | Position on the S-curve |
| Risk-factor language ("changing consumer preferences," named technologies) | 10-K Item 1A, Indian AR MD&A | What management fears; read the specific fears, skip boilerplate |
On the anchors, a substitutes score of 1 means no plausible alternative does the job. Jet fuel for airlines is one case, since nothing substitutes for the input, and cement for construction is another, to date. A 5 means the substitute is already cheaper and improving faster, and switching is nearly free. Think of print classifieds against online around 2005. That pool didn't shrink. It teleported.