Does Size Matter? Why Brands Should Think Small To Grow Big
- Barry Lemmon
- Jun 1
- 3 min read
Updated: Jun 2
Byron Sharp delivered the simple truth in How Brands Grow that the ONLY route
to brand growth is through buyer acquisition. Our work looks at what happens
on the purchase occasions when a brand acquires a new buyer. These occasions
– which are essential for brand growth – are called First Purchases. By
contrasting First Purchases with Repeat Purchases we identify the drivers of
First Purchases to help brands gain new buyers. We have analysed nearly 5
million purchases spanning different countries and categories, and through this
work we have uncovered a number of ‘universal truths’ about First Purchases.
Previously we have looked at how First Purchases of brands are usually
unplanned in advance, and how price promotions impact First Purchases. Today
we look at pack size and price in a little more detail.
The First Purchase Curve
The First Purchase rate for a brand is the proportion of sales that are First
Purchases. Our research has shown that smaller pack sizes have a significantly
higher First Purchase rate than larger pack sizes.
Smaller pack sizes are, of course, associated with lower price points, and it
follows that lower price points have a far greater First Purchase rate than higher
price points. The First Purchase curve for a brand plots the First Purchase rate
by different price points.

Each brand has its own First Purchase curve. For most brands the shape of the
curve is similar to Brand A in the example above (although there are some
important exceptions, especially in the case of value brands).
The First Purchase curve helps explain what happens when a brand is price
promoted. If a large pack at a high price is discounted the First Purchase rate
increases slightly, but it is still significantly lower than the First Purchase rate for
smaller packs at lower prices. And it is not unusual for the lowest price points to
have a First Purchase rate that is 30%-40% greater than the highest price points.
Do Small Packs Really Matter?
Small pack sizes often make only a minor contribution to total brand sales.

In our example Brand A is available in 3 sizes – small, medium and large. The
small pack size accounts for just 13% of brand sales by value, BUT the small pack
is the entry point to the brand for new buyers, accounting for 36% of First
Purchases of Brand A. And even though the large pack size accounts for nearly 5
times as much sales value for Brand A, it does not attract as many First
Purchases as the small pack!
This creates a conundrum for the brand: the small pack size is essential for
growth, but it doesn’t contribute much to brand revenue. How can the brand get
retailers to prioritise the small pack, and ensure good distribution and position
on shelf?
Do Small Packs Matter to Retailers?
Retailers grow their share of a category in exactly the same way that brands do –
by gaining more buyers. So just as First Purchases drive growth for brands,
shoppers making a First Purchase of a category in the retailer drive growth for
retailers. We have seen that small pack sizes at lower price points drive First
Purchases for brands, but what helps drive First Purchases in a category for the
retailer?

If we look at the First Purchase curve for Category X in Retailer Y as in the
example above we see that there are two factors helping bring new buyers of the
category to the retailer. First is that brands, rather than private label, have a
higher First Purchase rate, and second is that it is the lower priced, smaller pack
sizes of brands that are most likely to attract new buyers of the category for the
retailer.
A Genuine Win-Win for Brands and Retailers!
Here is a genuine win-win for brand and retailer! The smaller, lower-priced
packs are winning new buyers for both the brand and the retailer, and are
driving growth for both.
So yes, size really does matter! If you are trying to drive growth for your brand:
Do you put enough emphasis on smaller pack sizes?
Do you know the First Purchase curve for your brand?
Do you have an ‘entry point offer’ in each channel?
Do you talk to retailers about the benefits of smaller sizes?
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