Key Takeaways

  • Kahindo Mateene watched annual revenue crash from $268,000 in 2023 to $50,000 after wholesale cancellations from accounts like Anthropologie, Nuuly, and Shopbop.
  • Running paid ads on Meta and Google burns cash without teaching a solo founder why customers buy, especially when ad budgets are tiny.
  • Insomnia Cookies founder Seth Berkowitz built toward 1,800 company-owned locations by ditching cupcakes and frozen yogurt to master one product first.
  • Guy Raz advised Mateene to prune her catalog to three to five best sellers, validate them in pop-ups, and take verified sell-through numbers to regional boutiques.
  • Berkowitz codified this survival playbook as Berkowitz's Core SKU Rationalization Method.

The Berkowitz's Core SKU Rationalization Method

Step 1: Reduce to the Core

Cut distracting peripheral products and focus inventory entirely on proven core offerings: “reducing the SKUs down to the core.”

Step 2: Master Simplicity and Repetition

Establish operational excellence around the central product: “be great at something simple, and repeat, repeat, repeat.”

Step 3: Layer Growth Platforms

Only introduce secondary products and complementary categories after brand authority is secured: “then, once that became incredibly well known, then you add platforms around it.”

When This Works (and When It Doesn't)

This method applies directly to businesses that over-diversified their inventory or suffered major revenue shocks. When wholesale partners pull orders, founders panic and try to sell everything to everyone. Berkowitz ran into that exact trap while building Insomnia Cookies. “I sold frozen yogurt, I sold cupcakes. I did everything,” he recalled. “Ultimately, what won was reducing the SKUs down to the core.” Stripping away catalog clutter conserves working capital and clarifies what the brand stands for in the mind of a shopper.

Where this breaks down is early exploratory phases. If an apparel label has not yet found an item customers actually want, cutting down to three arbitrary styles risks picking the wrong losers. You cannot double down on a core until the market reveals what that core is. In Mateene's situation, however, she already had historical sales data from Anthropologie, Rent the Runway, and Shopbop before those accounts canceled. She knew which silhouettes people bought; she just had too many distractions surrounding them.

What to Do With This

If wholesale accounts drop your brand or your inventory costs eat your margins, run this exercise by Friday.

Open your sales ledger from the past twenty-four months and sort every SKU by net dollar margin. Isolate the top three to five items responsible for the bulk of repeat purchases or quick sell-throughs. Put everything else on final sale or pause production immediately.

Next, take those three to five items to local pop-ups, community trunk shows, or trunk events in your region. Do not buy Meta ads. As Berkowitz noted about digital platforms, “Meta and Google is so appealing because I can turn it on, create content, go, but also it is unclear to understand how the data is exactly working.” Pop-ups force you to watch customers touch the fabric, ask questions about sizing, and hand over a card.

Log the qualitative feedback and collect fifty clean transactions. Take the resulting sell-through rate, print a one-page line sheet featuring only those proven pieces, and walk into ten independent boutiques within driving distance. Small boutique buyers want verified winners that turn inventory quickly, not sprawling catalogs from unproven lines.