General
Scalability
Whether you can serve many more customers without your costs or effort rising just as fast.
Example
Software is scalable because the 10,000th user costs almost nothing; a consulting business is not.
Related terms
Unit Economics
The profit or loss from a single customer or sale. If each unit loses money, growing faster just loses money faster.
Capacity
The maximum your team or setup can handle before quality drops or things break.
Technical Debt
Shortcuts taken to ship faster that make future changes slower. Like a loan — fine briefly, expensive if never repaid.
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