The analysis notebook · Day 06

What makes a
business hard to copy?

Many businesses earn good profits in one good year. The better question is: why would the profit last when competitors can see it?

AYUSH RAJ · 9 OCTOBER 2026 · CONCEPT NOTEBOOK

The simple answer: a competitive advantage is anything that lets a business keep earning more than its rivals, even after they try to copy it.
01 / The idea

A moat is a protected profit.

Investor Warren Buffett used the word "moat" for the superiorities a business has that make life difficult for its competitors. He used the test in his 2007 letter to Berkshire Hathaway shareholders: has the moat widened or narrowed over the year?

Professor Michael Porter's Harvard Business Review work on competitive forces gives a student-friendly frame: an industry's profit depends on rivalry, new entrants, substitutes, and the bargaining power of buyers and suppliers.

02 / Common sources of advantage

Five ways to be hard to copy.

01

Scale and cost

When a business is large, each unit can cost less to serve. Jio reported over 533 million subscribers in Q1 FY27 and an EBITDA margin of 53.3% on revenue from operations.

02

Distribution

Reaching the customer is hard to copy. Hindustan Unilever reports reaching over 9 million outlets and working with over 3,500 distributors (FY2024-25 highlights).

03

Brand and trust

A known brand lets a business charge more or win repeat buying. This is the hardest to measure. I look for repeat customers and pricing power rather than just fame.

04

Switching costs and network effects

When customers find it costly or inconvenient to move, or the product gets better as more people use it, rivals struggle. Airtel reports its postpaid customer base reached 30.0 million, a segment where customers tend to stay longer.

The Airtel point is my reading of why postpaid matters; the 30.0 million figure is from Airtel's Q1 FY27 press release.

03 / A test I can use

Four questions before I call it a moat.

1. Does the business earn better margins than its rivals, and has it for years?
2. Can a rival copy the product easily?
3. Does the advantage get stronger or weaker with scale?
4. Could a price war or a new technology break it?

Even a strong position can be tested. In Q1 FY27 Eternal said food delivery margins were near the upper end of its 5-6% of order value steady-state range, while Swiggy reported 3.1% in the same business. A gap like this is a clue to look at, not proof of a moat.

Eternal figure: shareholder letter coverage by The Economic Times. Swiggy figure: Swiggy Q1 FY27 press release. They define order value differently.

04 / What I learned

A moat is a claim to test, not a label.

My biggest lesson: a profitable company is not the same as a protected company. I need to ask why competitors have not taken the profit away, and whether that reason will still be true in five years.

This will help me read every company in this series with one extra question: what is hard to copy here?

A commerce student's learning notebook. Not investment advice or a recommendation to buy or sell any share.

Source notes

The receipts behind the numbers.

  1. Berkshire Hathaway: 2007 shareholder letter · Buffett on "moats" as superiorities that make life difficult for competitors.
  2. Harvard Business Review: How Competitive Forces Shape Strategy (Michael Porter) · The competitive forces framework.
  3. Reliance Industries: Q1 FY27 media release · Jio subscribers, EBITDA margin.
  4. Hindustan Unilever: FY2024-25 performance highlights, Customers · Outlets reached and distributor count.
  5. Bharti Airtel: Q1 FY27 press release · Postpaid customer base.
  6. Eternal: Q1FY27 shareholders' letter and results · Official results page; food delivery details as reported by The Economic Times: https://economictimes.indiatimes.com/markets/stocks/news/will-blinkit-growth-sustain-amid-competition-5-things-to-know-from-eternals-shareholder-letter/articleshow/132556814.cms
  7. Swiggy: Q1 FY27 press release · Food delivery adjusted EBITDA margin.
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