Douglas Harper's Etymology Dictionary
plutonomic
"of or pertaining to the science or study of wealth or riches," 1853, from comb. form of Greek ploutos "wealth" (see Pluto) + ending from economic. Fell from currency 1870s, revived 1990s. Related: Plutonomics (1991); plutonomist (1869).
Wiktionary
plutonomic
a. Of or pertaining to plutonomy