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Prime Numbers
Your client is an investor evaluating the U.S. market for premium e-commerce memberships β€” programs like Amazon Prime that offer benefits such as fast shipping, streaming content, and exclusive deals. They’re particularly interested in estimating the total annual consumer spend on premium e-commerce subscriptions in the United States. How would you size this market?

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πŸ“‹ Solution:

Prime Numbers

Step 1: Estimate the U.S. Adult Population

Start with total U.S. population: ~330 million
Assume ~75% are adults β†’ 330M Γ— 75% = ~250 million adults

Step 2: Segment Adults by Online Shopping Behavior

Not all adults shop online or subscribe to premium services. We'll segment:

  1. Heavy online shoppers (frequent purchases, value convenience) – ~30%
  2. Moderate online shoppers – ~40%
  3. Low or non-online shoppers – ~30% β†’ excluded from TAM

β†’ 250M adults Γ— 70% = ~175 million addressable online shoppers

Step 3: Estimate % Who Have Premium E-Commerce Memberships

  • Assume 60% of heavy online shoppers have a premium membership
  • Assume 20% of moderate online shoppers do
    β†’ (250M Γ— 30%) Γ— 60% = 45M
    β†’ (250M Γ— 40%) Γ— 20% = 20M
    β†’ Total: ~65 million paying subscribers

Step 4: Estimate Average Annual Spend per Subscriber

Include both single-retailer memberships (e.g. Prime, Walmart+) and multi-retailer bundles
Assume:

  • Average annual price per membership = $120
  • Some people hold multiple memberships or family bundles
    β†’ Adjust average spend to $150 per person per year

Step 5: Calculate Total Annual Market Size

65 million Γ— $150 = ~$9.75 billion per year

Final Answer

Estimated annual U.S. consumer spend on premium e-commerce subscriptions: ~$10 billion