Geographic differentials are used by employers to recognize that there are differences in the cost of labor in different work locations.
Typically, the employer will establish a pay grade structure based on the national pay data for a country. Or they will use the headquarters location if that is where most employees are working.
Then they will compare the compensation data for all work locations in relation to that baseline (national or headquarters location). The baseline is labeled 100% and the other work locations are above, below, or near that 100%.
For instance, the list may look something like this:
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