Google’s Ngram Viewer, a tool that allows you to see the popularity of terms that appeared in printed sources between 1500 and 2019, illustrates this point: during the 20th century the frequency of the term “energy price” remained quite negligible, until a sudden spike that began in the early 1970s (caused by OPEC’s quintupling of crude oil prices; details of which follow later in this chapter) and peaked in the early 1980s.
