Function notation word problems

Problem

Aiden is a taxi driver.
M, left parenthesis, n, right parenthesis models Aiden's fee (in dollars) for his n, start superscript, t, h, end superscript drive on a certain day.
What does the statement M, left parenthesis, 8, right parenthesis, is less than, M, left parenthesis, 4, right parenthesis mean?
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