In Lawrence v. Toys R Us, 453 Mich. 112, 121; 551 N.W.2d 155 (1996), the Supreme Court of Michigan held that the statute requires the average weekly wage to be computed on the basis of all employment, even if the injury does not disable the employee from all employment. Lawrence, 453 Mich. at 122-123. An employer is protected from paying unnecessary compensation by subsection 361(1), which provides that a partially disabled employee is entitled to eighty percent of the difference between the after-tax average weekly wage earned before the injury and the after-tax average weekly wage the employee is able to earn after the injury. Lawrence, 453 Mich. at 124-125.