If money income stays the same, but the price of one good goes up, the effective purchasing power falls, and vice versa.
Purchasing power is linked with Inflation.
... Minister (1960-1972) February 20 - Alexei Kosygin[?], Premier of the Soviet Union[?] (+ 1980) February 25 - Adelle Davis[?], nutritionist, writer (+ 1974) ...