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Guide
A two-for-one offer that adds pesos at close
Put a quiet period to work. Choose the drink, calculate how many pairs you need to sell and measure the money the offer adds.
Updated October 11, 2026
At a glance
- Compare the same period with and without the offer.
- Charge for one, cost both servings.
- Start where capacity is free, rather than in a period that already fills up.
What promotion research can tell you
Wu, Kimes and Dholakia found mixed outcomes among restaurant operators using daily-deal coupons. Higher revenue did not ensure making money, and existing guests accounted for some demand. These were coupon deals, not a two-for-one experiment in Mexican bars. Use the findings to ask better questions, rather than forecast an uplift.
Contribution per pair
Use prices before tax and consistent cost treatment. Pair contribution = price charged for the offer − variable cost of both servings. Include ingredients, mixers, ice, garnish, expected waste, consumables and fees. Add labor that changes with each order without counting it twice.
Illustrative example: regular price $120, variable cost $30 per drink. A regular drink contributes $90. Two drinks for $120 contribute $60 per pair, or $30 per drink.
When the offer adds money: a worked example
Baseline: 20 drinks produce $2,400 revenue less $600 variable cost, or $1,800 contribution. The offer adds $500 advertising and extra labor. No food add-ons or future visits are assumed.
| Scenario | Servings | Revenue | Variable cost | After added expense | Change vs baseline |
|---|---|---|---|---|---|
| Baseline | 20 | $2,400 | $600 | $1,800 | $0 |
| 30 pairs | 60 | $3,600 | $1,800 | $1,300 | −$500 |
| 40 pairs | 80 | $4,800 | $2,400 | $1,900 | +$100 |
Thirty pairs mean 60 drinks but leave $500 less after the added cost. Forty pairs leave $100 more. With other fixed costs unchanged, this difference changes the period result; it is not total business profit. Matching the baseline plus extra cost requires at least 39 pairs: ($1,800 + $500) ÷ $60, rounded up.
Myths worth checking
- A high margin does not make every discount profitable.
- Double the drinks does not mean double the profit.
- Offer purchases are not automatically new demand: regular guests may switch or move their visit.
- Future full-price visits count only when observed and costed.
- Recipe costs, speed, waste and capacity vary by product.
Pick an offer you can serve
Choose a quiet period and a reliably costed recipe. Calculate the pairs needed to beat a normal shift, then check bar, glassware, ice and kitchen capacity. Publish the item, serving size, time window and conditions before ordering. A bundle or discounted second item may work better than two-for-one.
Record both servings, even if one is priced at zero. Keep the advertised portion and quality consistent. Compare several equivalent periods and the whole week; moving Friday demand to Thursday is not necessarily growth.
Try your numbers
MXN before tax. Consistent costs; enter pairs, not drinks.
Example difference: $100
Baseline: $1,800. Pair: $60. Need 39 pairs to match or beat it.
This is a scenario, not a demand forecast. Baseline means sales that would have happened without the offer. Other-sales adjustment is net contribution: positive for genuinely added food sales, negative for displaced sales outside the baseline. Do not subtract the same lost sale twice.
Watch the close, then decide
Track total contribution, actual servings, waste, preparation time, occupancy and displaced sales. Decide stopping conditions in advance if contribution or service deteriorates. Keep responsible-service judgment for alcohol and offer alcohol-free alternatives.
POS supports sales records; Purchasing and Operations scope cover additional cost and inventory work. Choose the plan scope that covers the sales records and cost controls you need. Book a conversation with a recipe and hourly sales.
Also read recommendations without discounts and portion control.
Frequently asked questions
Can two-for-one increase profit?
Yes, when added contribution exceeds discounted baseline sales, new costs and displaced contribution. More volume alone does not prove it.
How do I calculate pair contribution?
Subtract both servings’ variable costs from the price charged, multiply by pairs sold, then compare against the baseline after added costs.
Why use pesos rather than margin percentage?
A lower percentage can accompany either higher or lower total contribution. Compare money left and the change against the alternative.
Which item should I promote?
Choose a reliably costed, consistently prepared item that can serve the needed demand without displacing more valuable sales.
Should both servings reduce stock?
Yes. Both servings consume inventory even if one is priced at zero.
Sources
Sources reviewed October 11, 2026. Numerical examples are illustrative unless attributed to a source. Check current supplier terms when comparing equipment or fees.
Try it with your menu
Bring one recipe, its cost and a shift report. Choose a test you can measure.
Book a conversationSee plans and scope