Stock Velocity Should Change How You Bid - Here's How

Stock Velocity as a Bid Signal

Stock velocity measures how quickly a product sells through its available inventory. A product that sells 100 units per week has different economics from one that sells 2 units per month - even if they have identical margins.

Fast movers generate cash quickly, reduce holding costs, and carry lower obsolescence risk. Slow movers tie up working capital, occupy warehouse space, and may eventually need markdowns. Your working capital cycle is directly affected by velocity.

Fast Movers: Reduce Bids

This is counter-intuitive but commercially sound. Your fastest-selling products typically have:

• • Strong organic demand (customers search for them by name)
• • High conversion rates (proven product-market fit)
• • Good reviews and social proof
• • Often lower margins (best-sellers tend to be competitively priced)

Bidding aggressively on these products often means paying acquisition cost for sales that would have happened organically. The incremental value of advertising fast movers is lower than the incremental value of advertising products that need a push.

Slow Movers: Increase or Pause

Slow-moving products need a binary decision, not a middle ground:

• • Worth investing in: Products with good margin that just need awareness. Increase bids to test demand at higher impression levels.
• • Not worth investing in: Products with low margin or low demand potential. Pause advertising and consider clearance through other channels.

The worst strategy is the middle ground - spending £5/day on a slow mover that generates one sale per month. That's not enough data for the algorithm to learn and not enough return to justify the spend. See the dead stock advertising trap.

Clearance Economics

For slow movers you need to clear, calculate the break-even: what CPA makes clearance via advertising cheaper than alternative disposal (markdown, wholesale, write-off)?

• • Holding cost: Storage, insurance, depreciation per unit per month
• • Markdown cost: Revenue lost if you discount to clear without advertising
• • Advertising clearance CPA: What you'd pay in CPCs to sell each unit at current price
• • Decision: If advertising clearance CPA is less than holding cost plus eventual markdown, advertise. Otherwise, markdown directly.

Feed Automation Setup

Automate velocity-based bid management through your feed:

• • Tag products with velocity tier in a custom label (e.g., custom_label_3: fast|medium|slow|dead)
• • Update velocity tiers weekly based on last 30 days of sales data
• • Create campaign segments by velocity tier with different ROAS targets
• • Fast movers: lower ROAS target (you're bidding less aggressively)
• • Medium movers: standard ROAS target
• • Slow movers: either aggressive clearance target or paused

Seasonal Velocity Shifts

Velocity isn't static. A garden furniture set is a fast mover in April and dead stock in November. Your velocity tiers need to account for seasonal patterns:

• • Compare current velocity against same period last year, not just the rolling 30-day average
• • Pre-load velocity shifts before seasonal transitions (don't wait for data to confirm what you already know)
• • Build clearance campaigns that activate automatically when velocity drops below threshold outside peak season

Next Steps