Plague How to trade during plague? See past precedents. Plague stone receptacles at parish & quarantine boundaries sterilised coins in vinegar, in exchange for goods. 1348-50 Black Death took 1/3 of Englanders. 1665-66 Great Plague killed 100,000 Londoners (1/4 of the city).  Then & now: Panic buyers welcome!  But disinfect before entry Guessed the Word? …