Rachel, 

The online course does not follow the text exactly.  The paragraph you referenced is not incorrect.  Most of the contents of this paragraph are spread throughout text in the state manual.  

You should know that "wage loss" in all areas of insurance is considered a supplemental benefit.  Wage loss is economic loss and can be recovered through insurance. In Workers Compensation, wage loss is considered the difference between post-injury wages and pre-injury wages and the amount paid for disability is determined by calculating the "average weekly wage" of the employee at the time of the injury, subject to a maximum of 66 2/3% at the time of the injury. This paragraph speaks to how the average weekly wage is calculated. 

Jan