1-___measures the percentage of preretirement earnings replaced by pension benefits. a. Gross displacement rate (GDR) /b.Net replacement rate (NRR)/ c.Total replacement rate (TRR)/ d.Gross replacement rate (GRR) 2-Social Security retirement system is tax financed and has been designed on a pay-as-you-go basis. True or False is the percentage of preretirement after-tax earnings replaced by pension benefits. a.. Net replacement rate (NRR) b.Gross displacement rate (GDR) c. Gross replacement rate (GRR) d.Total replacement rate (TRR) .