Revenue is every dollar customers hand you — profit is the only part you actually keep. Every business, from a lemonade stand to a game studio, keeps score with the same few numbers.
🧾The Scoreboard: One Saturday Stand
You charge $2 a cup and sell 30 cups on a hot Saturday. The cash box holds $60 — but $60 is not what you earned.
⚠️Revenue is the biggest, flashiest number in business — and the most misleading. A company can collect millions in revenue and still lose money if its expenses are even bigger.
🔀Two Flavors of Cost
🪧FIXED COST
Stays the samePaid once, no matter how much you sell. Two cups or two hundred — still $10.
🪧 poster · markers · big pitcher · a $12 booth fee
🍋VARIABLE COST
Grows with salesEvery cup demands its own lemon, sugar, ice and paper cup — about $0.50 per serving.
🍋 30 cups × $0.50 = $15 of variable cost
✂️Inside One $2 Cup: Margin
⚖️The Magic Cup: Break-Even
$10 fixed cost ÷ $1.50 margin ≈ 6.7 → round up to 7 cups. Cups 1–6 dig you out of the hole. Cup 7 fills it. From cup 8 on, every sale drops real money in your pocket.
🏷️Price Is an Experiment
$4.00
too high?
Your margin more than doubles — but the family next door charges $1, so customers may walk right past you.
$2.00
the example price
$1.50 of margin per cup, break-even at cup 7, and $35 of profit after 30 cups.
60¢
too low?
You'll sell out fast — but with only a dime of margin per cup you'd need a hundred sales just to break even.
🔬Price is the amount you ask customers to pay for one item — and smart founders treat it like an experiment: try a number, watch what customers do, and adjust.
🫙Plan It: Budget & Investment
A budget is a written plan for how money will be earned, spent, and saved. Money you put back in — the bigger pitcher — is an investment: money spent now hoping to earn more later.
🌟Two Kid Founders Who Kept Score
🐝Mikaila UlmerMe & the Bees Lemonade · Austin, Texas
age 4Stung by bees twice in one week (2009). Instead of declaring war, she researched bees and learned they pollinate much of our food.
the ideaA stand selling Great Granny Helen's 1940s recipe sweetened with honey — plus a promise to give part of her earnings to bee-protection groups.
age 9Pitched on Shark Tank and walked away with a $60,000 investment.
age 11Whole Foods agreed to stock her lemonade in 55 stores across 4 states.
todaySold in more than 1,500 stores — and she still donates part of her profits to honeybees.
🎀Moziah BridgesMo's Bows · Memphis, Tennessee
age 9Couldn't find bow ties cool enough to wear, so his grandmother — a retired seamstress — taught him to sew his own at the kitchen table.
age 11Pitched on Shark Tank and made a shocking move: he turned down the investment money.
insteadInvestor Daymond John told him to keep full ownership of his company, and mentored him for free.
age 15Signed a seven-figure deal making bow ties with the logos of all 30 NBA teams.
🔑Key Terms
💰RevenueAll the money a business collects from sales, before any costs are paid.
🧾ExpenseAny money a business has to spend in order to operate.
🪧Fixed CostA cost that stays the same no matter how much you sell.
🍋Variable CostA cost that grows with every item you make or sell.
🏆ProfitThe money left over after all expenses are subtracted from revenue.
✂️MarginWhat's left from one single sale after subtracting what that item cost to make.
⚖️Break-EvenThe point where money earned exactly equals money spent — no loss, and no profit yet.
🌎Where It Shows Up in Real Life
🍿 Movie theaters
Theaters keep only part of each ticket sale — much of it goes back to the film studios. The high-margin snack counter, where popcorn costing pennies sells for dollars, is what pays fixed costs like rent and projectors.
🚚 Food trucks
Many chefs launch a truck instead of a restaurant because a truck's fixed costs are far lower than a building's rent. That shrinks the break-even point — they need far fewer customers each day before earning a profit.
🍋The nonprofit Lemonade Day has helped more than 1.5 million kids plan, budget, and run their own real lemonade stands, with nearly a hundred communities holding an official citywide stand day.
⭐Remember This
1Revenue is everything customers pay you; profit is what's left after every expense — a business survives on profit, not revenue.
2Splitting costs into fixed (stay the same) and variable (grow with each sale) reveals your margin per sale and your break-even point — the sale where losses flip to gains.
3A budget plans your money before you spend it, and reinvesting profit as an investment is how tiny stands — like Mikaila's and Moziah's — grow into real companies.
⭐Mixing up revenue and profit is the classic rookie mistake. $60 in the cash box, $25 of costs, $35 truly earned — always finish the subtraction!
✏️ ClickClass Anchor Chart · The Money of a Business