What Price Promotions Really Do And What They Don't

Price promotions are one of the most commonly deployed tactics in marketing. Whether it's a seasonal sale, a retailer-led markdown, or a brand-driven push to “move the month,” promotions are often seen as a fast way to drive volume and make an impact.

But while discounts can create short-term spikes in sales, the broader question remains: do they contribute to long-term brand growth?

Decades of marketing science, most notably Byron Sharp’s How Brands Grow, suggest the answer is more complex. Used in isolation, price promotions rarely build brand loyalty, increase penetration, or shift consumer habits in a meaningful way. But when integrated into a broader strategy focused on mental and physical availability, promotions can play a productive supporting role, amplifying demand, clearing inventory, or reactivating lapsed buyers.

Promotions Drive Temporary Sales Among Existing Customers 

Contrary to popular belief that discounts attract new shoppers or shift loyalty, the data shows:

• 50–60% of promotional volume comes from frequent buyers
• 20–30% from semi-frequent buyers
• A mere 5–10% from new or non-buying households

This means that the majority of sales uplift during promotions is driven by existing customers, not previously disengaged consumers. Following the promotion, sales promptly revert to baseline, highlighting a short-term effect, not growth.

Forward Buying: Demand is Borrowed, Not Built 

Promotional periods often result in what Sharp labels as forward buying — when customers accelerate purchases or stock up, borrowing from future demand. This artificially inflates sales during the promotion, followed by a compensatory dip afterward.

Without isolating baseline sales, marketers risk misinterpreting timing shifts as true incremental growth.

Promotions Rarely Drive Brand Penetration 

A key assumption often made is that lowering prices will convert non-buyers into brand loyalists. However:

• Light category buyers and non-buyers are significantly less responsive to price promotions than regular customers
• Promotions therefore have limited efficacy in increasing penetration rates

Although promotions may trigger occasional trials, few promotions translate into repeat purchases or deeper brand loyalty.

Risks of Frequent Discounting 

While promotions may boost short-term visibility, over-reliance introduces several dangers:

• Margin erosion
• Consumer conditioning — reinforcing “only buy on sale” behavior
• Brand dilution, particularly for premium brands
• Cannibalization of full-price sales

These factors underscore why promotions should be tactical, not strategic.

Sustainable Growth Comes from Availability, Not Pricing 

Sharp’s broader insights emphasize the importance of:

• Mental availability — salience and recognition
• Physical availability — ease of finding and buying the brand

Campaigns that reach a broad audience through mass media and wide distribution lay the strongest foundation for long-term growth, far more so than price incentives

Bain & Company echoes this, noting that “the best way brands can grow over the long term is to grow their number of buyers.” While seemingly simple, time and time again they have found that growth is about increasing household penetration. (Penetration is defined as the percentage of market households buying a particular brand in a given year.)

The 60/20 Buyer Rule: Light Buyers Matter 

Sharp challenges the conventional “80/20” assumption (80% of revenue comes from 20% of customers). :

• The top 20% of users generate about 50–60% of total sales
• The remaining 80% of buyers (mostly light users) account for 40–50% of sales

This distribution underscores the importance of reaching the broader, lighter buyer base. The same group least engaged with price promotions.

A Smarter Role for Promotions in Dealer and Retail Marketing 

While the evidence is clear that price promotions alone do not drive long-term brand growth, it would be a mistake to dismiss them entirely. Promotions can still serve an important role when used intelligently within an integrated marketing strategy.

When paired with consistent advertising, strong brand assets, and wide distribution, price promotions can:

• Help clear excess inventory
• Support key retail partnerships
• Create moments of urgency when launching new products
• Reactivate lapsed customers in short bursts
• Amplify advertising during high-traffic seasons

The key is not to make the discount the brand, but to make the discount a supporting tactic—reinforcing mental availability and accelerating volume when it aligns with broader objectives. “

Promotions are most effective when they ride the wave of brand demand, not when they try to manufacture it in isolation.” — Byron Sharp, How Brands Grow 

A 2022 NielsenIQ meta-analysis of over 4,000 promotional campaigns found that price promotions paired with brand media investment achieved a 29% higher return on ad spend (ROAS) compared to standalone discounts with no brand support.

Similarly, McKinsey research shows that brands that layer short-term promotional tactics on top of ongoing brand-building efforts enjoy stronger market share growth and higher marketing ROI over time.

Final Takeaway 

Promotions are not inherently bad. But relying on them as your primary marketing lever is a short-sighted strategy.

Use them purposefully, not habitually. Integrate promotions into a system that builds long-term mental availability, drives physical reach, and continuously recruits light buyers.

That’s how brands grow—not just for the quarter, but for the long haul.