01
What Is a Business?
A business is an organized system that creates and captures value. It converts resources such as labor, capital, knowledge, technology, relationships, and physical assets into products or services that customers value.
value created − value captured = economic opportunity
Entrepreneurship is the process of identifying or creating opportunities under uncertainty and organizing resources to pursue them.
02
What Is a Startup?
A startup is not simply a small company. In the YC tradition, the central problem is to discover a repeatable business model capable of producing substantial growth.
Early-stage startups operate under extreme uncertainty. Their primary task is therefore discovery: determine who has a painful problem, build a solution, determine whether people actually want it, and create a mechanism for repeatable growth.
- Problem discovery.
- Customer discovery.
- Product development.
- Product-market fit.
- Growth.
- Business-model development.
- Organizational scaling.
03
The Y Combinator Operating System
YC's public startup methodology repeatedly emphasizes a small number of high-leverage behaviors: launch, build something people want, talk to users, move quickly, do things that do not scale, find product-market fit before scaling aggressively, and measure growth.
- Launch now.
- Build something people want.
- Write code and talk to users.
- Find 10–100 customers who love the product.
- Do things that don't scale.
- Remain small and nimble before product-market fit.
- Do not optimize growth before the product is loved.
- Treat founder relationships as strategically important.
- Avoid unnecessary complexity and distractions.
- Focus the company on one important problem at a time.
04
The Founder Feedback Loop
build → launch → observe → talk → learn → change → rebuild
A startup becomes an experimental system. Each iteration should reduce uncertainty about the customer, product, distribution channel, economics, or technical feasibility.
The important output of an early iteration is not code volume. It is information that changes what the company does next.
05
Business Models
- Subscription.
- Usage-based pricing.
- Transaction fees.
- Marketplace take rate.
- Enterprise licensing.
- Advertising.
- Hardware sales.
- Hardware plus recurring software.
- Services and consulting.
- Freemium.
- Infrastructure consumption.
- Licensing and royalties.
A business model answers who pays, what they pay for, how much they pay, when they pay, and what it costs the company to deliver the value.
06
Unit Economics
gross profit = revenue − cost of goods sold
LTV ≈ gross profit per customer × expected customer lifetime
CAC = sales + marketing spend / new customers
Unit economics test whether a business becomes economically stronger as it acquires more customers. Exact formulas vary substantially by business model, contract structure, churn, gross-margin profile, and customer lifetime.
07
Business Strategy
Strategy is the selection of where to compete, what to build, which customers to prioritize, what capabilities to develop, and what activities not to pursue.
- Market selection.
- Customer segmentation.
- Product positioning.
- Differentiation.
- Distribution.
- Cost structure.
- Capital allocation.
- Defensibility.
- Timing.
08
Deep-Tech Entrepreneurship
Deep-tech businesses commercialize difficult technical breakthroughs, often requiring substantial research, hardware development, specialized infrastructure, regulatory work, or long development cycles.
- Scientific feasibility.
- Engineering feasibility.
- Manufacturing feasibility.
- Capital intensity.
- Certification and regulation.
- Supply-chain reliability.
- Time to market.
- Market willingness to pay.
Deep-tech founders must therefore reason simultaneously about technology and economics. A technically impressive system is not necessarily a viable business.