Up until Richard Nixon 1971 a dollar was fixed to price of an ounce of gold.
Prices remained very "Stable" for generations while a Dollar was fixed 2 gold price
In the 1960s/1970s our Federal Government spending got way outta control.
That forced Former President Richard Nixon to suspend the "Gold" 2 USA Dollar standard.
Thru the rest of the 1970s prices shot up 30/50 percent but by the mid 1980s had "Stabilized" somewhat carried us into the 1990s & early 2000s