Riddle me this: your employee sustains a work-related injury, receives workers’ compensation benefits mandated by the Pennsylvania Workers’ Compensation Act, continues receiving compensation benefits for several years, voluntarily relocates out of the sylvan compensation sanctum of Pennsylvania, crossing state lines through the mailed facility of uninterrupted compensation payments, while slowly recovering, years later, from the work injury, such that the injured employee is found to have sufficiently recovered from the work injury to be physically capable of performing some level of full-time, light-duty work; the question being what geographic anomaly must be applied to the gleeful irony of “earning power”, such that the Pennsylvania employer is entitled to petition for a modification of compensation benefits from temporary total to temporary partial disability?