The Unit Economics Stack

Module: Ecommerce Empire Builder Instructor: Kevin Gundersen Topic: Unit Economics Framework for DTC Brands

The Only Number That Matters

I'm going to say something that might sound extreme: contribution margin per order is the single most important number in your business. Not revenue. Not ROAS. Not follower count. Contribution margin per order. If that number is negative, nothing else you do matters. You are paying people to buy your product.

Let me walk you through the Unit Economics Stack. This is the framework I use to evaluate every product, every channel, every campaign we run at Inno Supps. It's not complicated, but most founders skip it because they'd rather look at revenue dashboards that make them feel good.

The Unit Economics Stack

Here's the full waterfall, top to bottom:

Gross Revenue (what the customer pays)
  - Discounts & Coupons
  - Refunds & Chargebacks
= Net Revenue
  - COGS (product cost, packaging, merchant fees)
= Gross Profit
  - Fulfillment (shipping, pick & pack, warehouse labor)
= Post-Fulfillment Profit
  - Customer Acquisition Cost (ad spend attributed to this order)
= Contribution Margin Per Order

Every line matters. Every line is a lever. But most founders only look at the top (revenue) and the bottom (bank account). The lines in between are where you win or lose.

Break-Even nCAC Calculation

Your break-even new customer acquisition cost (nCAC) is the maximum you can spend to acquire a new customer and not lose money on the first order. Here's the formula:

Break-Even nCAC = AOV - COGS - Fulfillment Cost

Let's run real numbers. Say you sell a supplement stack:

• AOV: $65
• COGS (product + packaging + merchant fees): $18
• Fulfillment (shipping + pick/pack): $9

Break-even nCAC = $65 - $18 - $9 = $38

That means you can spend up to $38 to acquire a new customer and break even on the first order. Every dollar below $38 is profit. Every dollar above $38 is a loss you're betting on LTV to recover.

Now here's where most people mess up. They look at their Meta dashboard, see a $30 CPA, and think they're profitable. But they forgot to subtract the 15% discount they ran, the 3% refund rate, and the $2.50 in merchant processing fees. Real nCAC tolerance is lower than you think.

Blended vs. Channel-Specific: Blended Hides Problems

This is critical. Blended unit economics are a vanity metric.

Say your blended nCAC is $28. Looks healthy against that $38 break-even. But break it down by channel:

Your cheap channels are subsidizing your expensive channels in the blended number. Google Brand and Organic are printing money, which makes Meta's $42 nCAC look acceptable in the blend. But Meta is where you're spending the most money, and it's underwater on a per-order basis.

Blended metrics hide channel-level problems. Always break it down. Always know which channels are actually contributing profit and which are consuming it.

Benchmarks: What Good Looks Like

After years of running DTC and advising other operators, here are the benchmarks I hold myself and my brands to:

• Gross Margin (Net Revenue minus COGS): 60-70% for supplements, 50-60% for apparel, 40-50% for electronics/hard goods. If you're below these ranges, your product economics are broken before you even start marketing.
• Contribution Margin Per Order: 25-35% of net revenue is healthy. Below 20% means you have almost no room for error. Above 35% means you have a strong product with pricing power.
• nCAC as % of AOV: Should be under 40%. If you're spending more than 40% of your AOV to acquire a customer, your margins are getting squeezed hard.
• Refund Rate: Under 5%. Above 8% and you have a product or expectation-setting problem.
• Discount Depth: Average discount should be under 15% of gross revenue. Heavy discounting destroys unit economics and trains customers to wait for sales.

The Death Zone: $10M to $50M

Here's a stat that should scare you: 73% of DTC brands die between $10M and $50M in annual revenue. Why? Because unit economics that "sort of work" at small scale completely break at scale.

At $2M/year, the founder is doing customer service, the team is lean, and you're running Meta ads yourself. Your effective overhead is low, so mediocre contribution margins still leave enough to cover fixed costs.

At $20M/year, you have a warehouse team, a marketing team, customer service staff, software subscriptions, an office, insurance, legal. Fixed costs went from $15K/month to $150K/month. That 22% contribution margin that felt fine at $2M now doesn't cover your overhead.

Scale amplifies your unit economics. Good unit economics get better at scale (volume discounts on COGS, better shipping rates, organic revenue grows). Bad unit economics get worse (you hire more people to handle problems, your ad costs increase as you exhaust efficient audiences, your return rate climbs).

The Rule: If Contribution Is Negative, Stop Scaling

I don't care what your growth rate is. I don't care what your revenue target is. If your contribution margin per order is negative, stop scaling immediately. Every new order is making you poorer.

Fix the economics first:

1. Can you raise prices? Test a 10-15% increase. You'll lose some conversion but gain margin.
2. Can you reduce COGS? Renegotiate with your manufacturer. Simplify packaging. Switch merchant processors.
3. Can you cut fulfillment costs? Renegotiate shipping rates. Optimize box sizes. Consolidate shipments.
4. Can you improve nCAC? Better creative, better landing pages, better offers, tighter audience targeting.

If the unit economics don't work at $10K/month in revenue, they won't work at $100K/month. Scale doesn't fix bad math. It makes bad math worse, faster.

Get the contribution margin positive and healthy. Then scale. That's the order. Always.