Herd Behavior

What Is Herd Behavior?

Herd behavior is when people copy what a crowd is doing instead of deciding on their own. It’s also called herd mentality, and it explains why a busy restaurant looks better than an empty one next door.

In marketing, herd behavior shows up whenever popularity becomes the reason to buy. Shoppers read “best seller” or “10,000 customers” as a sign that a choice is safe.

The Psychology Behind Herd Behavior

People follow the crowd for three main reasons:

• Social proof: when we’re unsure, we treat other people’s choices as information. Robert Cialdini named this one of his six principles of persuasion.
• Conformity: in Solomon Asch’s 1950s line experiments, people gave an obviously wrong answer about a third of the time because the group did.
• Information cascades: once a few people pick something, later people copy them and ignore what they know, so the trend snowballs.

Fear of missing out adds pressure. If everyone else seems to be getting in, staying out feels like a loss, which is why herd behavior often pairs with FOMO marketing.

Herd Mentality Advertising Examples

Brands use the crowd as proof in a few repeatable ways:

• Purchase counts: Amazon shows labels like “bought in past month” on product listings, so a shopper sees demand at a glance.
• Running totals: McDonald’s put “Billions and Billions Served” on its signs, turning sheer volume into the message.
• “Most popular” badges: SaaS pricing pages, including Kajabi’s, tag one plan as the most popular so visitors pick the plan others picked.
• Best seller tags: retailers flag top-selling items, which then sell even faster.
• Live activity: small notifications like “12 people signed up today” show that real people are buying right now.

For more ways to show the crowd on your own site, see this guide to social proof marketing.

When Herd Behavior Backfires

Following the crowd isn’t always smart, for shoppers or for brands:

• Panic buying: the 2020 toilet paper shortages started as fear and spread because empty shelves told others to stock up too.
• Bubbles: market crashes like the dot-com bust grew from people buying because everyone else was.
• Fake popularity: invented counts or bought reviews break trust once shoppers spot them, and can break consumer law.
• The wrong crowd: “Thousands of students love it” won’t move a business owner, because people follow groups they identify with.

How to Use Herd Behavior in Marketing

Herd behavior works best when the crowd is real, recent, and relevant:

• Use real numbers: show actual customer counts, purchases, and sign-ups, and keep them current.
• Show the right crowd: match the proof to the visitor, like reviews from other coaches on a coaching page.
• Put it where people decide: near the price, the add-to-cart button, or the sign-up form.
• Keep it recent: “28 bought this week” beats a lifetime total that never moves.

Herd behavior is one of many shortcuts in consumer decision making.

It often works alongside the scarcity principle, since a crowd buying something also makes it feel scarce.