TD Ameritrade 2018 Annual Report

36 Average Yield (Cost) Fiscal Year '18 vs. '17 Net Yield Increase/ (Decrease) '17 vs. '16 Net Yield Increase/ (Decrease) 2018 2017 2016 Segregated cash . . . . . . . . . . . . . . . . . . . . . . . . 1.37 % 0.58 % 0.21 % 0.79 % 0.37% Client margin balances. . . . . . . . . . . . . . . . . . . 4.58 % 3.79 % 3.65 % 0.79 % 0.14% Other cash and interest-earning investments . . 1.26 % 0.63 % 0.18 % 0.63 % 0.45% Client credit balances. . . . . . . . . . . . . . . . . . . . (0.03)% (0.01)% (0.01)% (0.02)% 0.00% Net interest revenue. . . . . . . . . . . . . . . . . . . . 4.07 % 2.69 % 2.59 % 1.38 % 0.10% The following tables set forth key metrics that we use in analyzing investment product fee revenues (dollars in millions): Fee Revenue Fiscal Year '18 vs. '17 Increase/ (Decrease) '17 vs. '16 Increase/ (Decrease) 2018 2017 2016 Money market mutual fund . . . . . . . . . . . . . . . $ 18 $ 16 $ 11 $ 2 $ 5 Market fee-based investment balances . . . . . . 539 407 363 132 44 Total investment product fees . . . . . . . . . . . . $ 557 $ 423 $ 374 $ 134 $ 49 Average Balance Fiscal Year '18 vs. '17 % Change '17 vs. '16 % Change 2018 2017 2016 Money market mutual fund . . . . . . . . . . . . . . . $ 4,164 $ 3,613 $ 5,671 15% (36)% Market fee-based investment balances . . . . . . 248,339 181,510 155,063 37% 17 % Total fee-based investment balances . . . . . . . $252,503 $185,123 $160,734 36% 15 % Average Yield Fiscal Year '18 vs. '17 Increase/ (Decrease) '17 vs. '16 Increase/ (Decrease) 2018 2017 2016 Money market mutual fund . . . . . . . . . . . . . . . 0.42% 0.42% 0.19% 0.00 % 0.23 % Market fee-based investment balances . . . . . . 0.21% 0.22% 0.23% (0.01)% (0.01)% Total investment product fees . . . . . . . . . . . . 0.22% 0.23% 0.23% (0.01)% 0.00 %