 It's aggregation properties make it very convenient for teaching macro economics because one does not have to deal with the messiness of upwards of 100 overlapping generations acting independently, but also interdependently.Consequently, it has become a mainstay in graduate macroeconomics training and underlies the work by Economics Nobel Laureate Ed Prescott and other economists on Real Business Cycle models.Kotlikoff's singly and jointly authored work in the 1980s and 1990 called this model into question on both theoretical and empirical grounds.