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Step-by-step explanation:
Garment factory: workers may get paid by the number of pieces they complete.
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Wood chopping: the worker gets paid by the number of cords of wood they produce, not by how long it takes.
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Haircut -- the cost is the same (for the same type haircut) even if more time is spent
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The above are instances where an individual worker gets paid by the piece they produce. There are numerous instances of companies getting paid by the job, regardless of the length of time or the quantity of materials required to do the job.
Lawn mowing -- the price is fixed each time the crew mows the lawn
Oil Change -- the cost of changing the oil in the car is not dependent on the time it takes or the amount of oil used
Car wash -- a fixed price is paid each time (at an automatic car wash)