Allocation vs. Replenishment: Getting the Right Product to the Right Place
Updated: Aug 21
You’ve bought the right product.
But there’s one more question:
Did you put it in the right store?
Imagine a retailer has just bought 10,000 units of a new fashion collection.
It could send all 10,000 units to stores immediately.
But what happens if customer demand turns out to be very different from the forecast?
This is where Allocation and Replenishment become critical.
Allocation vs. Replenishment
The easiest way to remember the difference:
Allocation = Where should the initial inventory go?
Replenishment = Where do we need more inventory now?
Allocation happens before—or at the beginning of—the selling period.
Replenishment happens after actual customer demand starts giving us new information.
The 70/30 Principle
A common approach in fashion retail is to avoid allocating 100% of the inventory immediately.
A retailer might start with something like:
70% → Initial Allocation30% → Central Reserve
The exact split isn't a universal industry standard. Depending on the product, retailer and level of demand uncertainty, 60/40, 70/30 or 80/20 can all make sense.
Let's take our 10,000 units.
Initial allocation
7,000 units are distributed to stores based on:
Store capacity
Historical sales
Expected demand
Customer profile
Size curves
Store performance
The remaining:
3,000 units
stay centrally available.
Why?
Because we don't know exactly what customers will do yet.
Then Reality Takes Over
Two weeks later, actual sales start telling us a different story.
Imagine:
Store A → Selling much faster than forecastStore B → Performing as expectedStore C → Selling slower than expected
Instead of having already committed all 10,000 units, the retailer still has 3,000 units available.
Those units can now be directed toward the stores where customers are actually buying.
The process becomes:
Forecast → Initial Allocation → Actual Sales → Replenishment → Learn
That's the real power of combining allocation with replenishment.
Why Not Allocate 100%?
Because a forecast is an estimate—not reality.
Imagine allocating all 10,000 units based on your initial forecast.
If Store A suddenly becomes a bestseller, you may have no stock left to respond.
Meanwhile, Store C might be sitting on excess inventory.
The problem isn't necessarily that you bought the wrong amount.
You may have simply put too much of it in the wrong place too early.
This is why the initial allocation should balance forecast confidence with flexibility.
Allocation Isn't Just About Sales
A common mistake is allocating purely based on historical sales.
But stores aren't identical.
A store may have:
Different customer demographics
Different physical capacity
Different traffic levels
Different local preferences
Different price sensitivity
A store that sold 100 units last year doesn't automatically need 100 units this year.
Modern allocation increasingly combines historical performance, demand forecasts, store characteristics and live trading data.
Replenishment Keeps the Winners in Stock
Once products start selling, replenishment becomes the engine that keeps inventory flowing.
For example:
A store receives 100 units.
It sells 70 units in two weeks.
Only 30 units remain.
If demand continues at the same rate, the replenishment system can trigger additional stock before the store runs out.
The goal is simple:
Don't wait until the shelf is empty to realise you have a bestseller.
Where It Fits in the Retail Planning Journey
This connects directly with everything we've covered in our Retail Planning Series:
MFP → How much can we invest?
Demand Forecasting → What are customers likely to buy?
Assortment Planning → What should we offer?
OTB → How much can we still purchase?
Allocation → Where should the initial inventory go?
Replenishment → Where do we need more inventory now?
Each stage takes the previous decision one step closer to the customer.
Final Thoughts
Allocation and replenishment are not the same thing.
Allocation makes the first decision.
Replenishment responds to what customers actually do.
The smartest retailers don't try to predict everything perfectly.
They create enough flexibility to learn from actual demand and react quickly.
That's why holding back part of the inventory—whether 20%, 30% or another appropriate level—can be a powerful strategy, particularly for products where demand is uncertain.
Ultimately:
The goal isn't simply to have enough stock. It's to have the right product, in the right place, at the right time, in the right quantity.
At MerchFlow Consulting, we believe merchandise planning doesn't end when the purchase order is placed. The real test begins when the customer starts buying.
How does your organisation approach initial allocation?
Do you typically allocate most of the inventory upfront, or keep a central reserve for demand-driven replenishment?
What works best in your business?
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