A linear relationship (or linear association) is a statistical term used to describe the directly proportional relationship between a variable and a constant.

The cost of labor is the total of all employee wages plus the cost of benefits and payroll taxes paid by an employer.

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George Eads, Marc Nerlove, William Raduchel, A Long-Run Cost Function for the Local Service Airline Industry: An Experiment in Non-Linear Estimation, The Review of Economics and Statistics, Vol. 51, ...