definition of superlinear

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“The biggest cost is basically in drilling the wells,” says Brian Anderson, a chemical engineer at West Virginia University in Morgantown who helped develop the economic models for the report. “We’re looking at a superlinear relationship between depth of completion and cost.”

Meaning, essentially ‘more than linear’ in terms of the relationship between two variables. In contrast to a direct, or linear relationship between to variables, or even a ‘sub-linear’ relationship between them. Useful for indicating that, for instance, the ‘non-linear’ relationship between an effect and the amount of money you need to use to achieve that effect might lead to diminishing returns or in other respects adhere to the general rule that “the last 10% is always the hardest.”

Defined in greater detail in this thread on ‘superlinear’.

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