In the Startup World:

Unit economics determine whether a business model scales profitably by analyzing the relationship between Customer Acquisition Cost (CAC—how much you spend to acquire a customer) and Customer Lifetime Value (LTV—total revenue that customer generates). VCs look for an LTV:CAC ratio of at least 3:1. CAC payback period (time to recoup acquisition costs through customer profit) should be under 12 months. Strong unit economics signal sustainable, scalable growth.

For Creators and Solopreneurs:

Your unit economics are the foundation of profitability and reinvestment capacity. If a customer costs you $100 in ad spend but generates $500 in lifetime value, your 5:1 ratio means you can reinvest profits to grow at scale. Calculate this obsessively: Track how much time/money you spend acquiring each customer type, and how much they spend over their lifetime. For a Substack writer, one organic follower might have infinite LTV (low or zero CAC) but low conversion to paid; one paid ad click might cost $2 with $150 LTV. Knowing this ratio guides whether you should write more content (high-LTV organic channels) or run ads (potentially lower LTV, faster growth).

Know your numbers, friends.

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