Every resource founders actually use, in one library.

What founders use most, ranked by how many answers lean on it.

1. A short clip where Gurley explains why top-down TAM estimates are often badly wrong, using Uber and the early cell phone market... Startup Archive Video · 5 min · Starting Up Bill Gurley on Why Founders and Investors Should Not Pay Too Much Attention to TAM Bill Gurley
2. This essay dismantles the seductive but hollow logic of if we just capture one percent of a huge market. It explains why that... Angus Norton, Predict Essay · 9 min read · Starting Up The 1% TAM Myth: Why Most Market Sizing Is Just Theater Angus Norton
3. A short, plain read on why the one percent capture argument backfires and how to reframe your sizing around real buyers. It... The Venture Crew Article · 8 min read · Starting Up Is the 1% Market Fallacy Holding Your Startup Back? Sahil S
4. A practical guide from a startup accelerator that walks through gathering the data behind both top-down and bottoms-up... MaRS Discovery District Article · 10 min read · Starting Up How to Estimate Market Size: Business and Marketing Planning for Startups MaRS Discovery District
5. A short primer on how real technologies move from ignored to inevitable in an S shaped curve, and why early flatness fools... Andreessen Horowitz Video · 4 min · Starting Up a16z Video: S-curves in Innovation Benedict Evans
6. This is the foundational research on how new ideas actually spread through a population, and why some stick while others die.... Simon & Schuster Book · 576 pages · Starting Up Diffusion of Innovations Everett M. Rogers
7. The gap between a big market and a paying market is willingness to pay, and this piece gives you a rigorous way to actually... Kellogg Insight, Northwestern Article · ~10 min read · Starting Up A Better Way to Measure Customers' Willingness to Pay Kellogg Insight
8. This tackles the exact case where no budget line exists yet because the problem is new to buyers. Altman argues an unbudgeted... Forbes Article · ~8 min read · Starting Up Why Budget Doesn't Matter in B2B Selling Ian Altman
9. If your market is real but latent, meaning the pain exists but no one is actively shopping, this is the playbook for creating... Bessemer Venture Partners (Atlas) Article · ~15 min read · Starting Up A B2B Founder's Guide to Generating Demand from Scratch Bessemer Venture Partners
10. The government's live registry of registered micro, small, and medium enterprises, filterable by state, district, and activity.... Ministry of MSME, Government of India Tool · Starting Up Udyam Registration Real Time Dashboard Ministry of MSME, Government of India
11. Downloadable district level datasets of registered enterprises you can filter and count yourself. Where the dashboard shows... data.gov.in Tool · Starting Up Udyam MSME Registered Units (Open Data) data.gov.in
12. Christensen explains why capable incumbents rationally ignore small, unproven, low margin new markets, which is exactly the... Harvard Business Review Press / Amazon Book · 288 pages · Starting Up The Innovator's Dilemma Clayton M. Christensen
13. This is a direct takedown of the round-number thinking our short answer warns against, written for founders who keep reaching... Startups.com Article · ~6 min read · Starting Up Avoid the Lame "1% of the Market" Approach Wil Schroter
14. A quick, plain read on why capturing one percent of a billion dollar market is a fantasy rather than a plan. It reinforces the... Inc. Article · ~5 min read · Starting Up The 1 Percent Fallacy That Trips Many Entrepreneurs Erik Sherman
15. Two YC partners explain how products that looked small at launch grew into large markets, which reframes the worry that your... Dalton Caldwell and Michael Seibel, Y Combinator Video · ~14 min · Starting Up Simple Products That Became Big Companies Dalton Caldwell and Michael Seibel
16. This is a direct, practical breakdown of what a real why now looks like and how founders talk themselves into fake ones. It... Lenny's Newsletter Article · 15 min read · Starting Up Why now? Lenny Rachitsky
17. A stark case of the opposite bet: an entire Indian industry built on a court-defined skill-game loophole that a new law erased... TechCrunch Article · Starting Up India bans real-money gaming, threatening a $23 billion industry TechCrunch
18. The direct follow up that models your exact case: roughly a hundred customers each paying a million or more (his brontosaurus),... The Angel VC blog, by Christoph Janz Essay · 8 min read · Starting Up Three more ways to build a $100 million business Christoph Janz
19. Tunguz studied SaaS companies that went public and found there is no single right customer value. Large companies were built on... tomtunguz.com, by Tomasz Tunguz Article · 5 min read · Starting Up The Optimal Average Customer Value for SaaS Startups Tomasz Tunguz
20. Lemkin's point is that almost everything about your company, from the sales team to support to marketing spend, is set by your... SaaStr, by Jason Lemkin Article · 6 min read · Starting Up Everything is Sort of the Same at a Given ACV Jason Lemkin
21. If your business is a small number of very large accounts, this is a practical playbook for actually landing them. It lays out... Wiley, by Tom Searcy and Barbara Weaver Smith Book · 240 pages · Starting Up Whale Hunting: How to Land Big Sales and Transform Your Company Tom Searcy and Barbara Weaver Smith
22. This is the second act in action: once you own a narrow vertical, adding payments and fintech can more than double your... Andreessen Horowitz (a16z) Article · 10 min read · Starting Up Fintech Scales Vertical SaaS Kristina Shen, Kimberly Tan, Seema Amble, Angela Strange
23. A focused essay on how vertical software companies grow past their first small market by layering on second and third products.... Fractal Software (Medium) Article · 9 min read · Starting Up How Second Acts Unlock Vertical SaaS Fractal Software
24. Veeva is the definitive proof of your thesis: a company serving only life sciences, with roughly a thousand customers, worth... Compound & Fire (Substack) Article · 15 min read · Starting Up Veeva Systems: Vertical SaaS Quality in Life Sciences Compound & Fire

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