As an aside:
Le Bon Marché (lit. "the good market", or "the good deal" in French; French pronunciation: [lə bɔ̃ maʁʃe]) is a department store in Paris. Founded in 1838 and revamped almost completely by Aristide Boucicaut in 1852, it was one of the first modern department stores. Now the property of LVMH, it sells a wide range of high-end goods, including food in an adjacent building at 38, rue de Sèvres, called La Grande Épicerie de Paris.
. there is a mention of this Store in Lucie Aubrac by Sian Rees.
Whereas Bon Marche in the UK began in the late 1980s.