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March 14, 2026

SmartUp Foundations – Lecture 4 – Business Models

By Yonatan Stern| 1.55 Hours| English| Part of the Foundations Course
How to Build a Successful Company: <br />
Profitable, fast growing and on a small investment<br />
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In this lecture Yonatan Stern discusses lean business models - and how companies that grow responsibly grow faster.<br />
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Guest speaker Eyal Lewinsohn Co-Founder and CEO of Iridize (acquired by Oracle) shares how the difficulty in raising funds was, in hindsight, the best thing that happened to the company.
  • The Three Pillars of a Successful Company: A successful business should strive for profitability from day one, grow fast, and require only a modest investment.
  • Cash is King: A functional business model is an operational cash flow spreadsheet, not an accounting Profit & Loss (P&L) statement. It must track all income and expenses over time (monthly) to ensure you can actually pay your employees and bills.
  • The Three Critical Metrics: Your business model must always calculate three vital numbers: how much total investment is needed (your maximum cash burn), how many months it takes to reach profitability, and how many months it takes to pay that investment back.
  • Test Assumptions Before Building: Use a “Branding First” approach to test your business model assumptions in the real world. You can run ads and use landing pages with different prices to test price elasticity and customer acquisition costs before you ever write a line of code or manufacture a product.
  • Bootstrapping Can Lead to Better Exits: The guest speaker’s company, Iridize, was bootstrapped without Venture Capital. Because they didn’t have VC investors demanding massive returns, they were a highly attractive and agile acquisition target for Oracle, allowing the founders to retain their equity. In contrast, heavily funded competitors often dilute founders significantly.
  • Pivot by Listening to the Market: Be open to how customers actually want to use your product. Iridize found success not by changing their software, but by listening to a customer and pivoting their target market from cash-strapped startups to massive enterprise employee training programs.

What's covered in the slides

  • The Three Pillars of Success: Building a company that strives for profitability from day one, grows fast, and requires only a modest investment.
  • What is a Business Model?: Defined not as a standard accounting P&L, but as an operational cash flow spreadsheet used to predict and track the financial impact of your assumptions over time (months).
  • Anatomy of the Model: Breaking down the spreadsheet into Income (products, services) and Expenses (direct sales costs/CAC, stable/fixed expenses, and one-time expenses).
  • The Three Critical Metrics: The model is ultimately used to calculate three essential numbers:
    1. Time to profitability (in months).
    2. Total investment needed (maximum cash burned).
    3. Time to pay back the investment.
  • Modeling Scenarios: Demonstrating how changing specific assumptions—such as the rate of customer churn or switching from monthly subscriptions to upfront annual billing—drastically impacts the cash flow and total investment needed.
  • Testing Assumptions (Branding First): How to use marketing tests (like A/B testing different price points on a landing page) to validate your spreadsheet’s assumptions before actually developing the product.
  • Guest Speaker Case Study (Iridize): Eilon’s story of bootstrapping his startup with no VC funding, executing a critical pivot to enterprise employee training, and eventually being acquired by Oracle.
  • Live Workshop (Chemos Thermos): A group exercise analyzing a real startup’s self-heating thermos, discussing how to identify high-paying target audiences, set pricing, and use cheap social media tests (like TikTok or Facebook ads) to gauge market demand.
SmartUp Foundations – Lecture 4 – Business Models – March 14, 2026

Given June 2nd, 2024 by Yonatan Stern

We are on to lecture four, and this one is on a different subject altogether, which is business models. I apologize in advance, there will be a lot of spreadsheets all over, because a business model is with spreadsheets, but I tried as much as possible to make them easy to follow and understand. I’ll start with the usual introduction. Myself, Libby is on vacation, so don’t look for her, and I allow. And again, what we try to do here is a program to teach the profession of building successful companies. And as I said many times, building a company is a profession like any other profession, which means you graduate from university, you might have some clues about the idea, but real life looks very different than all the people with companies, not their head.

It is very different than what you might be studying in school, and so we teach it. First of all, we said building successful companies, and we have a definition of what is a successful company, and we’re going to dive into that definition at length during this meeting. So there are three criteria, three pillars of the idea. One is the company has to strive for profitability from day one. That’s the target of the company, produce money, be cash flow positive. That’s number one. Number two, it has to be fast growing. And number three, it has to have a modest investment, because as I will describe later on, this whole notion of how you do the financing and for people like you that might be very interesting, he’s angel investor.

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