How a Business Really Makes Money: Contribution Margin, Break-Even & Fixed vs. Variable Costs

Can your client pay their bills? How many sales do they need before they make a single dollar? Is every new sale helping them, or quietly losing money? In this full lecture from my capstone consulting class, I walk through the economic model I use to diagnose any small business: volume, margin, cost structure and revenue drivers. We sort real costs into fixed and variable, calculate contribution margin, find the break-even point, turn it into a daily scoreboard, and then apply all of it to a case: a farmer's rocky land turned into a paintball park. We finish with how AI simulations let you test decisions before risking money, and the three questions every owner has to be able to answer. What you'll learn: Why accounting is the language of business Volume vs. margin: the grocery store and the jewelry store One test that sorts any cost into fixed or variable Why fixed costs equal risk, especially early on Contribution margin: price minus variable cost Break-even: fixed costs divided by contribution margin From break-even to daily targets and capacity Diagnosing a business: the Paintball Battleground case Simulating decisions before you spend Bookkeeping basics and the three financial statements CHAPTERS 0:00 The Dr. Claude Kershner Show 0:20 Contribution margin is everything 0:37 The language of business 1:56 Volume vs. margin 3:55 Fixed vs. variable costs 11:11 Contribution margin 15:41 Break-even 22:38 Diagnosing a business: Paintball Battleground 35:41 Test before you bet: business simulations 39:58 Know your numbers 44:17 Outro PROBLEMS THIS LECTURE SOLVES My client is busy but not profitable (11:26) I don't know which costs are fixed and which are variable (4:17) How many sales do we need to break even? (15:52) How do we turn break-even into a daily target? (20:01) Our business model is stuck. How can we fix it? (22:42) Key formulas Contribution margin = Price − Variable cost per unit Break-even (units) = Fixed costs ÷ Contribution margin per unit Reference: Morris, Schindehutte & Allen (2005), "The entrepreneur's business model," Journal of Business Research. Dr. Claude Kershner | Leadership, Entrepreneurship & Consulting thedrclaudekershnershow.com #Consulting #SmallBusiness #Entrepreneurship #BreakEven #ContributionMargin