Definition

Kotler defines product mix as “the set of all product lines and items that a seller offers for sale.” Product line decisions involve breadth, length, depth, and consistency.

Introduction

Companies rarely sell one item—they manage portfolios. Think of a product mix as an orchestra where every instrument (line) must harmonize.

Explanation

1️⃣ Product Line – group of related products (e.g., iPhone series).
2️⃣ Product Mix Width – number of product lines.
3️⃣ Length – total products across lines.
4️⃣ Depth – versions per product.
5️⃣ Consistency – how closely lines relate.

Key Takeaways

Balance variety with brand clarity.

Broader mix can reach more markets but raises complexity.

Consistency reinforces brand identity.

Real-World Case

Nestlé has multiple product lines—dairy, beverages, confectionery—each with deep variants under a consistent brand umbrella.
Reference: https://www.nestle.com