Driving traffic and basket size in modern retail

# Driving traffic and basket size in modern retail

IKEA's floor plan is a marketing document. A shopper who came for one Billy bookcase picks up a big blue bag at the entrance (carrying things by hand is awkward on purpose), walks a one-way route past dozens of furnished rooms, stops for meatballs priced below what any restaurant nearby would charge, and reaches the self-serve warehouse only at the end. Nobody advertised the lamp, the plant pot or the 40-pack of tea lights. The building sold them.

Those are the two levers sitting underneath every campaign a retailer runs: getting people through the door, physical or digital, and getting more into the basket once they are inside. Both are built out of layout, assortment and placement before any media money is spent.

The two numbers that run a store

Retail revenue reduces to a chain:

Traffic x Conversion x Basket size = Sales

• Traffic (footfall): how many people enter, or visit online.
• Conversion: the share who actually buy.
• Basket size (average transaction value): how much each buyer spends.

Improve any one and the store grows. The catch is that they interact. A deep price on a staple lifts traffic and can shrink basket size if shoppers grab the deal and leave. That behaviour is cherry-picking, and fighting it is half the job.

Footfall economics

The loss-leader is a product sold at or below cost to pull people in. Treat it as an investment. If a store loses $1.50 on a jug of milk, the shopper it attracts spends $80, and gross margingross marginGross margin is the share of revenue left after subtracting the direct cost of producing goods or services, expressed as a percentage of revenue.View full definition → runs at 25 percent, the visit returns roughly $20 of gross profit. Losing $1.50 to earn $20 is good arithmetic. If 40 percent of those buyers take only the milk, the blended return collapses.

Two constraints marketers tend to meet late. Selling below cost is not always legal: France prohibits resale below cost outright, and several US states have unfair sales acts imposing minimum markups on categories such as milk, alcohol and fuel. And the payback does not have to come from the basket at all. Costco has held its rotisserie chicken at $4.99 for years and went as far as building its own poultry complex in Nebraska to control the cost of holding that price. Costco caps its merchandise markups in the mid-teens, so the chicken is never repaid by a fat margin on the rest of the trip; it is repaid by renewal, and membership fees supply the majority of the company's operating profit. Same tactic, different P&L. Copy the chicken without the membership and you have simply bought traffic at a loss.

Store layout as a marketing tool

Every decision about where products sit either extends the shopper's path or shortens it. Both can be right.

The perimeter loop

Most supermarkets push staples (milk, eggs, produce, meat, bread) to the outer walls and the back. To reachreachThe number of unique people exposed to your message in a given period. Unlike impressions, reach counts each person once, no matter how often they see it.View full definition → the milk you pass thousands of other products. The longer the path, the more chances to trigger an unplanned purchase.

The failure mode: this only pays on a large planned shop. Aldi bet the opposite way, with about a thousand square metres of selling space, few aisles, in and out in ten minutes. Smaller basket, higher frequency, far lower cost to serve per euro of sales. Imposing a long walk on someone buying three items produces abandonment, not attachment, which is why urban convenience formats invert the classic loop.

The decompression zone

The first few steps inside are the decompression zone. Shoppers are still adjusting from the car park and rarely buy there, so retailers keep it open, put seasonal displaysdisplaysThe total number of times an ad or piece of content is displayed, regardless of clicks. Each display counts as one impression, even to the same person.View full definition → just beyond it and steer traffic deeper.

Eye level is buy level

Shelf position is negotiated and optimised. High-velocity or high-margin items sit at adult eye level; children's cereal sits lower, at a child's eye level, on purpose. The mapmapUsing software to automate repetitive marketing tasks and campaigns, enabling personalisation at scale across channels like email, web, and social.View full definition → specifying all of it is the planogram.

Assortment size decides who controls that mapmapUsing software to automate repetitive marketing tasks and campaigns, enabling personalisation at scale across channels like email, web, and social.View full definition →. A full-line supermarket carries tens of thousands of SKUs; Costco runs a few thousand, Aldi somewhere around 1,500 to 2,000, most of it own label. With almost no branded suppliers, Aldi has nobody to sell eye level to and little reason for an intricate planogram: stock stays in cut cases on the pallet. It gives up placement income and gains merchandising labour it never has to pay for.

Endcaps and hotspots

The endcap, the display at the end of an aisle, is prime real estate, and suppliers often pay slotting fees to land there. A hotspot can also be a whole category: Aldi's middle aisle of weekly non-food specials brings people in for the specials themselves, a traffic tactic dressed as merchandising. The price is buying discipline, since those lines are one-shot and cannot be reordered when they sell out.

Cross-merchandising: the basket multiplier

Cross-merchandising places complementary products together so buying one nudges you toward the other. It is the cheapest lever on basket size.

• Tortilla chips stacked next to salsa and guacamole.
• Strawberries beside whipped cream and shortcake.
• Batteries hanging in the toy aisle.
• Wine in the cheese section.
• Bedding a few steps after the bedroom settings, the way IKEA sequences rooms into the marketplace.

Each pairing raises the attachment rate: the share of shoppers who buy item B when they buy item A.

The Super Bowl endcap

In the days before a big game, stores build one display combining chips, dip, soda, wings and disposable plates. A shopper who came for wings leaves with the party, because the display removes the work of assembling the occasion. The measurement trap is that most of what rings through it would have been bought in the aisle anyway; judge the display on incremental category lift, not on the sales scanned at the display.

For a deeper look at how physical retail uses data to plan these decisions, the U.S. Census Bureau's monthly retail trade data is a free, authoritative source for tracking category-level sales trends.

Digital and omnichannelomnichannelAn integrated approach connecting all customer touchpoints (physical, digital, mobile) into a seamless experience, with shared data and consistent context across channels.View full definition → traffic

By 2026, footfall is not only physical. The same physics run online.

Online loss-leaders and attach

"Customers who bought this also bought" is cross-merchandising in software. A free shipping threshold ("spend $35 to ship free") is basket engineering: set it modestly above current average order value, high enough to require one more item, low enough to look reachable. Then watch contribution, because a shopper who clears the bar with the cheapest thing on the site has made you pay for delivery to win a $4 add-on.

Buy online, pick up in store

BOPIS (buy online, pick up in store) drives physical traffic deliberately: a shopper collecting an order walks past displaysdisplaysThe total number of times an ad or piece of content is displayed, regardless of clicks. Each display counts as one impression, even to the same person.View full definition → and often adds at pickup. Curbside handover deletes that walk and with it the whole argument. Both formats also move picking labour from the customer to the payroll, so attach at collection has to cover the pick cost before the channel earns its place.

Paid placement, on shelf and on screen

Sponsored search slots are the endcap's digital twin, the same trade of visibility for supplier money, run through the media business a separate lesson takes apart. The second-order effect belongs here. When placement follows the highest bid, both the planogram and the results page start optimising for supplier budgets instead of shopper missions: search time rises, conversion drops. That revenue is high margin; the traffic it can erode is not.

From basket data to shelf decisions

The identity data behind a scanned card (whose mechanics the loyalty lesson owns) has one use that belongs squarely here: it tells you what to put next to what. Market basket analysis finds the pairs:

Rule:  {diapers} -> {baby wipes}
Support:     6% of all baskets contain both
Confidence:  70% of diaper buyers also buy wipes
Lift:        3.2x more likely than random

Lift above 1 means the pairing beats chance. Place wipes with diapers, in aisle and online, and build a bundle.

Some cautions before you move a fixture. Lift is correlation: many pairs co-occur because they share a single shopping mission, and putting them together can shorten a trip you were being paid for. The famous beer-and-diapers finding is quoted everywhere and sourced almost nowhere, so treat any single anecdote as a hypothesis to test with a real display and a control store. Rules on rare items also look spectacular at low support, and a 12x lift on 0.3 percent of baskets is a rounding error dressed as insight.

Putting the levers together

Back to the blue bag. The system, in order:

1. Traffic: a price-led hero item, or a rotating specials aisle, supplies a reason to come this week rather than next.

2. Layout: the route decides how many categories the shopper meets before the trip ends.

3. Cross-merchandising: pairs and occasions remove the mental work of building a basket.

4. Repeat: what the basket data records feeds next week's placement.

No single tactic carries it. A loss-leader without layout leaks profit to cherry-pickers. Layout without pairing wastes the walk. And a long path imposed on a short mission sends the shopper to the store that respects their ten minutes.

Key Takeaways

• Traffic x Conversion x Basket size = Sales. Every tactic pulls one lever and disturbs the others.
• Loss-leaders are repaid by attach, or by something else entirely: Costco's $4.99 chicken is funded by membership renewal, not by basket margin. Know which mechanism funds yours.
• Below-cost pricing has legal limits, outright in France and through minimum-markup statutes in several US states. Check before building a traffic plan on it.
• Assortment is a layout decision. Aldi's short path and roughly 1,500 to 2,000 SKUs trade basket size for frequency and cost to serve; the perimeter loop only pays on a large planned shop.
• Online repeats the same physics with sharper cost lines: shipping thresholds, "also bought" modules and pickup each move basket, and each carries delivery, picking labour or bid-driven placement that can swallow the gain.