"What we see is the Netherlands is hitting constraints on all sides; the way to alleviate this is to expand [labour] supply."
"A part of her will live on forever."
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The “Knocking on Wood” Wikipedia page mentions Roud’s conclusion, and this claim of a 19th century origin has circulated online as the final say on the matter. If you go back to the original, though, Roud’s proposal actually ends on an ambivalent note: “Before this theory [of 19th century origins] can be finally accepted, however, an examination of the history of European forms of this custom would be advisable.”
Upheld complaints
Restore to a checkpoint