It’s often been speculated that Paul-Émile de Puydt’s 1860 essay Panarchy might have been influenced by his fellow Belgian Gustave de Molinari’s similar ideas about competitive security services in his 1849 works The Production of Security and Soirées on the Rue Saint-Lazare.
Well, I don’t have new light on that question, exactly, but I have discovered that De Puydt’s essay received a highly favourable review in a journal edited by Molinari. I’ve just translated and posted the review, here.