“No staff means zero labor cost, so is everything else automatic profit?” An unmanned ice cream shop may resemble a large vending machine, but its ledger still contains rent, electricity, payment fees, stock, waste, theft, repairs and the owner’s time. A modest opening budget does not automatically mean a low break-even point.
Key points
- In one shop example, a 600-won item left 168 won after a 432-won purchase cost, before payment and fixed costs; it is not an industry average.
- Calculate monthly break-even sales by dividing fixed costs by the weighted contribution ratio, including shrinkage, waste, discounts and owner time.
- Compare Small Business 365 trade-area data and KFTC franchise disclosures with field observation and contract terms under three sales scenarios.
Three-line summary
- In one reported shop, a 600-won item cost 432 won to buy, leaving 168 won after merchandise cost. This is one operator’s case, not an industry average.
- The 168 won is not net profit. Payment costs, rent, electricity, security, communications, repairs, waste and shrinkage still come out.
- Check trade-area data and franchise disclosures, then calculate monthly break-even under optimistic, base and pessimistic sales scenarios.
Information was checked at September 27, 2026, 09:07 KST. The topic ranked second in Donga Ilbo’s Naver most-read list for 08:00–09:00. We cross-checked the tools offered by Small Business 365, the Korea Fair Trade Commission’s franchise portal and Seoul’s trade-area service.
1. From 600 won to 168 won is only half the calculation
In the Donga Ilbo case, the purchase cost of a 600-won ice cream was 72% of its price, or 432 won. It takes about 596 units to accumulate 100,000 won before other costs: 168 × 596 = 100,128 won. Donga Ilbo on Naver
The first profit calculation for a 600-won ice cream
The 168 won after a 432-won purchase cost is a starting contribution, not net profit.
Components of a 600-won sale
Unit: won · one reported unmanned-shop case
- 01Sales-linked costsCard, mobile pay and promotions
- 02Allocate fixed costsRent, power, security and data
- 03Apply lossesTheft, waste, damage and refunds
- 04Value owner timeOrdering, stocking, cleaning, complaints
The graphic labels 168 won as the amount after merchandise cost. It still precedes payment fees and monthly costs such as rent, electricity, security, communications and repairs. The article’s summer electricity figure of roughly 1 million won is also one operator’s account for a shop of around 33 square meters, not a standard for every store.
The first useful formula is:
> Contribution per unit = selling price − purchase cost − payment fees − other costs that rise with sales
Contribution must cover fixed monthly costs before operating profit begins.
2. Break-even sales require a weighted margin
Purchase ratios vary by product, and snacks and drinks change the mix further. Use the actual quantities sold to calculate a weighted contribution-margin ratio.
> Weighted contribution-margin ratio = sales less merchandise and sales-linked costs ÷ total sales
> Monthly break-even sales = monthly fixed costs ÷ weighted contribution-margin ratio
If fixed costs were 3 million won and the contribution ratio 20%, mathematical break-even sales would be 15 million won. This is an illustrative example, not a forecast for a location. The result changes sharply if shrinkage, waste and discounts are omitted.
3. Five boxes every ledger needs
| Cost box | Record | Easy to miss |
|---|---|---|
| Merchandise | Purchase price, delivery, discounts | Slow stock and expiry waste |
| Sales-linked | Card and payment costs | Coupon and promotion sharing |
| Space | Rent, service charges, electricity | Seasonal freezer power and capital tied in deposits |
| Unmanned operation | CCTV, security, data, kiosk | Lost sales during failure and repair visits |
| Loss and labor | Theft, damage, refunds, owner time | Ordering, stocking, cleaning and complaints |
If the owner’s time is priced at zero, comparing a side job with a full-time business becomes misleading. Record monthly hours and divide operating profit by those hours as a second test.
4. Location is more than “heavy foot traffic”
Small Business 365 provides trade-area analysis using sales, store, floating-population and other data, plus business and startup diagnostics. Korea’s National Assembly Budget Office notes that national and local systems can return different trade-area information. Treat estimated sales as an input, not a guarantee, and inspect the same address across boundaries and time periods. NABO analysis
For a residential ice cream shop, count evening and weekend foot traffic, nearby households, schools, academies, supermarkets, convenience stores and direct competitors. In Seoul, the Seoul trade-area service offers quarterly store counts, estimated sales and floating population. Public data has update lags and estimation methods, so it does not replace field observation.
5. For a franchise, look beyond average sales
The KFTC franchise portal lets prospective owners compare initial fees, interior costs, store changes, regional average sales, contract periods and violations. Average sales is not expected net profit at your address. Review closures and terminations, mandatory items, recurring payments and the basis for any sales estimate.
Before signing, collect these in one file:
1. Lease, service charges and power contract for the candidate site 2. Current product purchase prices and return or waste terms 3. Purchase or rental and repair terms for kiosk, freezers and CCTV 4. Franchise disclosure and the basis of any projected sales 5. Twelve-month cash flows for base, downside and upside scenarios
The final pre-opening question
Can your cash survive sales 20% below the base case alongside higher electricity and waste? An unmanned store lacks an attendant; it does not lack management. The 600-won item is an interesting starting number. The break-even worksheet must arrive before the deposit leaves your account.