Gerber's argument, made in The E-Myth Revisited, is that most small businesses are started by technicians — a good baker, a good plumber, a good designer — who assume that being good at the work qualifies them to run a business that does the work. It does not, and the two jobs are almost unrelated.
The result is an owner who has bought themselves a demanding job with worse hours and less security than the one they left.
Work *on* the business rather than *in* it: build the systems, documentation and roles that let the work happen without you. His framing is to build the business as though you intended to franchise it, whether or not you ever would.
Three roles every owner has to play, and most people are comfortable in one. Recognising which one you avoid tells you what your business is missing, and it is usually the manager.
If a task exists only in your judgement, you can never delegate it and never take a holiday. Writing down how something is done is the unglamorous work that decides whether you have a business or a job.
A useful test even if you never sell. It forces the question of whether the business could run without you — which is also exactly what a buyer is paying for.
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Any owner who is the bottleneck, works in the business every day, and cannot see how that ends.
Repetitive, and the systems-and-franchise framing suits repeatable service work far better than bespoke or creative businesses.