Three numbers decide whether a business becomes a money machine or slowly bleeds out: customer acquisition cost (CAC), customer lifetime value (LTV) and profit margins. Every business starts as a dream, and it gets exciting until you run the numbers. Whether it is a lemonade stand or a software company, you will face these three metrics, and most people do not know what they mean or how to use them.
Here is each metric with its formula, the examples used to explain it, and how the three fit together.
Watch the full video here, or skip to the breakdown below.
The 3 metrics at a glance
1. Customer Acquisition Cost (CAC)
Every business eventually asks how much it costs to get a new customer. That number is CAC: total sales and marketing spend divided by the number of new customers. If you spent 10,000 dollars on Facebook ads last month and got 100 customers, your CAC is 100 dollars.
The trap shows up if the average customer only spends 80 dollars with you. You pay 100 to get 80 back, so winning more customers drives you out of business. A business can look exciting with new customers every month, but if CAC is higher than what each customer brings, you are paying to go bankrupt. A lemonade stand shows it: 10 dollars on posters brings 5 people, which is 2 dollars per visitor, and a 1 dollar cup loses money on every sale.
CAC almost always rises over time. The cheapest customers are friends and early adopters, and later you must reach people who are harder to convince as ads get pricier, competition rises and channels saturate. The video says that in 2022 Shopify merchants saw paid-ad acquisition costs jump 60% year on year, and Facebook and Instagram ad costs nearly doubled in five years. Apple does not need to spend 100 dollars on ads to make 100 in sales because it built its brand years ago, but 99.9% of businesses are not Apple.
2. Lifetime Value (LTV)
If CAC says what a customer costs, LTV says what they are worth: all the money a customer brings across the whole relationship, including renewals, upsells and referrals. The formula is average purchase value times number of purchases times average customer lifespan. A customer who spends 50 dollars a month for 12 months has an LTV of 600 dollars. Against a CAC of 100 that is a solid business, and against a total of 50 you are done.
The video’s rule of thumb is the LTV:CAC ratio: for every dollar spent acquiring a customer, make at least three back over time. A 10 dollar a month game subscription shows why. If the company paid 30 dollars to win the player, one month is a 20 dollar loss and three years is a 330 dollar profit. That is why companies accept losses upfront, since they are betting on LTV.
Netflix at about 15 dollars a month is worth 540 dollars over three years, so it can spend 100 dollars or more to get you. The average Starbucks customer spends 14 dollars a week, 728 a year, and over a decade is worth more than 7,000 dollars, which is why it invests in loyalty apps and offers. The higher your LTV, the more you can spend on CAC: a software business charging 50 dollars a month can spend 500 to acquire a customer, while a 5 dollar t-shirt shop cannot spend 50 to sell one shirt.
LTV only works if you keep customers, and most businesses overestimate how long people stay. Gyms calculate with members staying two to three years, but 50% quit within six months, so a 1,200 dollar LTV is closer to 300. That is why gyms lock you into annual contracts, why loyalty cards and rewards exist, and why subscriptions are annoying to cancel. The longer you forget, the higher the lifetime value.
3. Margins
Margins show how much profit you keep from each dollar you earn, and they are the ultimate truth detector. You can have low CAC and great LTV and still fail on razor-thin margins. There are two types:
- Gross margin: (revenue minus cost of goods sold) divided by revenue. It tells you how profitable your product is.
- Net margin: net income divided by revenue, after all expenses including salaries, rent, marketing, taxes and debt. It tells you how profitable your business is.
Sell something for 100 dollars that costs 40 to make and your gross margin is 60%. If after staff, rent, marketing and taxes you keep 10 dollars, your net margin is 10%. In the cookie example, ingredients cost 2 dollars on a 5 dollar cookie, leaving 3 gross, but 2 more for electricity, packaging and delivery leaves 1 dollar of net.
Margins decide how fast you scale, how much you can reinvest and whether you survive downturns. A Gucci handbag costs a few hundred dollars to make and sells for thousands, with gross margins above 70%. Grocery stores live on 1 to 3% margins and survive on volume, which is how Walmart makes billions. Software often has 70 to 90% gross margins because distributing code to millions costs almost nothing, so investors love fat margins, recurring revenue and high LTV.
The video says the average S&P 500 company runs around 10% net margin, Microsoft and Google 25 to 30%, Hermes 30 to 40% operating margins, and supermarkets and airlines 1 to 5%. That is why investors care more about margin growth than revenue growth: 10 million dollars at a 2% net margin keeps 200,000, while 5 million at 20% keeps 1 million. Bigger is not always better.
How the three fit together
CAC shows the cost of growth, LTV shows the reward, and margins decide whether you actually keep anything. Together they decide whether a business scales into a money machine or slowly bleeds out.
These three are only the starting point. The video names churn, burn rate, payback periods, contribution margins and cash conversion cycles as the next layer of numbers that separate amateurs from professionals.
FAQ
What is customer acquisition cost?
CAC is the total sales and marketing spend divided by the number of new customers. Spending 10,000 dollars to win 100 customers gives a CAC of 100 dollars.
What is customer lifetime value?
LTV is the total money a customer brings across the whole relationship: average purchase value times number of purchases times average customer lifespan. Someone paying 50 dollars a month for 12 months has an LTV of 600 dollars.
What is a good LTV to CAC ratio?
The video gives a golden ratio of at least 3 to 1. For every dollar you spend acquiring a customer, you should make at least three back over time.
What is the difference between gross and net margin?
Gross margin is revenue minus the direct cost of producing the product, divided by revenue. Net margin subtracts all expenses, including salaries, rent, marketing and taxes.
Why do investors prefer software and luxury companies?
Software often has 70 to 90% gross margins and luxury brands like Hermes report 30 to 40% operating margins, far above supermarkets and airlines at 1 to 5% net margins.
Why does CAC usually rise over time?
The easiest customers come first, such as friends and early adopters. Later you must reach harder-to-convince people while ads get more expensive and channels saturate.
Keep reading
- 10 Awesome Documentaries That Every Entrepreneur Must Watch
- 15 Things You Should Know When Starting a Business
- 15 Differences Between a High Value vs Low Value Couple
