By James Cormack Barcelona and Paris Saint-Germain have encountered one another with such frequency in modern times that a simmering rivalry has been allowed to brew. There’s nothing eternal about Barca and PSG’s competitive spat but this rivalry has transcended mere on-field battles. The pair have often duelled over transfer targets following PSG’s rise to elite relevance in the 2010s, with the French club’s artificially cultivated financial might coming to the fore when they prised Neymar away from Catalonia for a world-record fee in 2017. Barca have so often been the thorn in PSG’s quest fo…