What is Assortment Planning in Retail & How to Optimize It?

Assortment planning is how a retailer decides which products earn shelf space and how much of each to hold. Done well, it puts stock where shoppers actually buy it and keeps cash out of slow sellers.

A store has a fixed amount of shelf, and each product on it blocks another that could have taken its place. The choices behind that trade-off shape sales and waste for the whole year, and they set the tone with suppliers. Buyers and their distribution partners watch them closely for that reason.

Al Maya Distribution sits on the supply side of those choices, moving FMCG goods for retailers across the region. This guide sets out how the planning process works, where its data comes from and where a distributor adds value.

Key Takeaways

• A strong range starts with local shopper demand, not the supplier catalogue.
• Width counts the categories a store carries, and depth counts the variants inside each one. Retailers tune both against shelf space and customer mix.
• Out-of-stocks cost real sales. The Erasmus Research Institute of Management reports a worldwide out-of-stock rate of about 7 to 8 percent, and 75 to 85 percent of the demand behind those gaps ends up lost or redirected to another item or location.
• Cut decisions hold up best when a team weighs sales velocity and substitutability together.
• A distributor such as Al Maya Distribution sees order patterns across many retail accounts, which lets a retailer test range changes against real demand and stock before committing shelf space.

What Is Assortment Planning and Why Does It Matter?

Assortment planning in retail sits between buying and merchandising. Buyers negotiate cost and terms with suppliers, while merchandisers lay out the shelf. The plan tells both teams what to work with.

The stakes show up in availability. Researchers at the Erasmus Research Institute of Management (ERIM) put the worldwide out-of-stock rate at about 7 to 8 percent in a seminar abstract, and they estimate that 75 to 85 percent of unfulfilled demand disappears or moves to another item or location. o9 Solutions, a planning software vendor, goes further and estimates that stockouts cost retailers about US$1 trillion a year, with 69 percent of shoppers who meet an empty shelf buying from a competitor. Treat the vendor figures as directional.

Overstocking hurts in the opposite direction. Too many lines slow stock turn and raise write-offs on short-life goods. The planning job is to find the range where availability stays high and inventory stays lean.

How Does Retail Assortment Planning Work Step by Step?

Most plans follow six steps, whatever the size of the store.

1. Define each category’s role. A traffic driver such as rice or milk needs a different plan than a category that exists to lift margin.
2. Read the demand data. Start with sales by store and week, then add basket analysis from loyalty cards where they exist.
3. Set width and depth. Decide how many sub-categories to carry, then how many brands and sizes sit inside each one.
4. Fit the range to the space. Convert the plan into shelf facings and confirm it works within the planogram.
5. Align supply. Confirm with suppliers and the distributor that lead times and minimum order quantities can support the range.
6. Review and adjust. Track sell-through and out-of-stock rates, then revisit the plan every quarter.

The assortment planning retail teams run each season needs a feedback loop. Sell-through data from the last cycle shapes the next one, so a plan nobody revisits drifts away from what shoppers buy.

How Do Retailers Plan a Product Assortment Across Store Formats?

Format sets the rules before any data arrives. Product assortment planning for a convenience store means a narrow range of fast movers with little depth, because every facing must earn its place within days. A hypermarket can carry far more categories and far more variants inside each one, including non-food, but it needs forecasting discipline to stop slow lines clogging the back of house.

Supermarkets sit between the two and fight hardest over chilled space, which costs more per facing than ambient shelving.

What Does a Retail Assortment Strategy Look Like in the UAE?

It starts with the shopper mix. Around nine in ten UAE residents are expatriates, and they come from more than 200 nationalities, so demand for staples and brands varies sharply by neighbourhood.

An assortment planning strategy built for the Emirates therefore treats each store as its own market. Two stores under one banner can need a very different retail product assortment when one serves a family district and the other a business district.

Seasonality adds a second layer. Ramadan and Eid reshape baskets so sharply that retailers plan separate seasonal ranges months ahead, and that lead time is where distributors come in.

Also Read: Why Accuracy Matters at Every Stage of Food Distribution

How Does Assortment Optimization Trim the Tail Without Losing Shoppers?

Every range collects tail products that sell a few units a week. They absorb facings and working capital, and cutting them frees both. The risk is removing a line that anchors a niche shopper’s whole basket, which can cost more than the line ever earned.

Four signals help a team decide what to review:

• Sales velocity stays below the category norm across several review periods.
• Margin contribution does not justify the facings the product holds.
• A close substitute already on the shelf would catch most of the demand.
• Short-life stock keeps ending up in write-offs.

Retail assortment optimization works best as a test-and-learn cycle. Retailers trial a range change in a small group of stores, measure the effect on category sales and not just the removed line, then roll it out.

Also Read: What is Centralized Warehousing and Why Is It Important?

What Does a Distributor See That a Single Retailer Cannot?

A retailer’s tills show what its own shoppers bought. A distributor’s order book shows what many retailers are reordering.

Al Maya Distribution supplies FMCG goods to retail customers in the UAE and the wider Gulf, so its team reads demand across accounts rather than inside one store. A product that reorders weekly in one emirate and sits untouched in another appears in the order book long before it shows up in a quarterly review.

That view makes the distributor a useful voice at planning time. Retailers who share range plans early give the distributor time to line up stock and flag any listing that supply cannot sustain.

How Does Warehouse Capacity Shape Assortment Management?

Warehouse space limits how wide a range can grow. Every extra variant needs a pick face and a replenishment rule. Space also decides how much seasonal stock a retailer can hold ahead of a peak.

Al Maya Distribution operates well over one million square feet of warehousing across the UAE, according to public company records, and the business pairs that storage with transport and cross-border trade in FMCG goods. Capacity at that level gives retail customers room to hold seasonal stock centrally and replenish stores in smaller, more frequent drops. A sound plan ties the shelf to that physical reality, so a range never grows faster than the supply chain can feed it.

The Bottom Line

A good range is never finished. It follows shopper demand and trims whatever stops earning its space. The best plans also stay inside what the supply chain can deliver, which is why retailers gain from bringing their distributor into the room early. Al Maya Distribution works with retail partners at exactly that point, where the shelf plan meets stock availability.

Frequently Asked Questions

How often should a retailer review its range?

Quarterly reviews suit most categories, with a lighter monthly check on fast movers and anything new. Seasonal categories need an extra review before each peak, since last year’s data describes a different calendar.

What is the difference between width and depth in a range?

Width counts how many categories or sub-categories a store carries. Depth counts how many variants, such as brands and sizes, sit inside each one. A wide, shallow range suits a small store, while a narrow, deep range suits a specialist.

How many SKUs is too many for a supermarket?

No single number applies. A range has too many lines when new additions split existing sales rather than adding to them, or when write-offs and out-of-stocks rise together. Tracking incremental category sales after each listing shows when that point arrives.

Can a distributor help a retailer decide what to stock?

Yes. A distributor sees reorder patterns across many accounts, knows which launches move and understands what its warehouses can hold. Al Maya Distribution brings that view to retail customers, which helps buyers test a range change against real order data before they commit shelf space.

Does online grocery change how a retailer plans its range?

Yes. An online shelf has no physical limit, but search results, substitution rules and the pick-and-pack process still impose one. Most retailers keep a smaller core range for fast delivery and place long-tail lines on a slower fulfilment path.