lets s see and assume I am to become brics fan. IMO, biggest barrier to brics common currency is also a language barrier. English is a world language and dollar is closely associated with it. You decided to transact with ruble or Yuan, but first thing that makes me very uncomfortable doing so is popularity of Russian or Chinese language. Every other corner of the world, English language is pronounced as world language. If you go to most countries, starting at airport what two languages you primarily see on signs? That countries own language and English. Sure you sometimes see several more langguages but you also never see a Chinese or Russian translation of local language to guide tourists.