It was inescapable when I was growing up in North America, though with education I came to view it as hopelessly lower-middlebrow.
https://en.wikipedia.org/wiki/Reader%27s_Digest
Crystal focuses on a regular feature called "It pays to increase your
word power", which first appeared in 1945, written by "dictionary editor
and lexical enthusiast" Wilfred J.Funk. (His son Peter took over after
his death, and replaced "increase" with "enrich" in the title.)
This leads on to the matter of vocabulary size. Crystal cites some figures:
-150,000 entries in "medium-sized [English] dictionary"
-50,000 words in passive vocabulary of most people (i.e. most people who
take the trouble to estimate it, by means of dictionary sampling)
-up to 100,000 for "well-read" people
Active vocabulary? Much harder to estimate.
"Samples suggest that our active vocabulary is likely to be about a
third of our passive."
That's a figure I hadn't heard before.
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