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The way it was worked out for a company I know here is a specialist company looked how long it would take a person in s similar company with a similar job to make the money a specific class of house cost and a specific model car
The result were roughly
SA : 3 years salary
UK : 2 years salary
USA : 1,5 years salary
They did indepth studies of costs of all types of goods and services and came up with the same averge numbers
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