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4 Kinds of Side Business

Experienced entrepreneur Justin Mares lays them out

  1. buy an existing asset
  2. launch a product on a marketplace with existing demand
  3. launch a unique, one of a kind product in a new space where you can buy demand (adwords, facebook, etc.)
  4. arbitrage (craigslist, airbnb, trading, uber)

He goes through each in detail and refers to the first as “probably the easiest, and (annoyingly) requires the most money to pull off.”

👉 But here’s a new site where you can buy small web based projects for less than $5000.

Complement Justin’s framework with my 19 types and 6 levels of online business.

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Updated: March 7, 2025

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