A turn of the screw

There was an industrialist
whose production line
inexplicably breaks down,
costing him millions per day.
He finally tracks down an
expert who takes out a
screwdriver, turns one screw,
and then - as the factory
cranks back to life - presents
a bill for £10,000.

Affronted, the factory owner
demands an itemised version.
The expert is happy to oblige:
"For turning a screw: £1. For
knowing which screw to turn:
£9,999."

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