Suppose we have find a relation between two quantities X and Y. When we say "The more Y, the more X" is it implied that the relation between Y and X is linear?

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    No, merely that it's proportional. The nature of the function is unspecified. – John Lawler Apr 10 '20 at 20:44

To my knowledge, it only describes a direct relationship. It has no bearing on the mathematical nature of the relationship beyond that

It could be linear, non-linear, proportional.

  • Thanks for the answer. – ado sar Apr 15 '20 at 14:27

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