Here's a reason you might not hear NDB talked about. Its old news. Believe it or not. BRICS and NDB were formed in 2014-15. Weird right? NDB was called the BRICS Development Bank. I have a link a the bottom to a Un-paywalled Washington post article titled "What the New Bank of BRICS is All About" 7/17/2014.

One of those things. I wasn't really down the rabbit hole yet, so it wouldn't have been on my radar. I was partying then.

I don't think there is an overlap of mandate. NDB is largely investments in countries outside of BRICS nations (to (ideally) benefit BRICS nations) The common currency would be to help facilitate trade for inter-BRICS country transactions. (Otherwise they would have to use one of eachother's currencies and people have expressed that nobody trusts eachother's currency enough, as they keep things less open than the US.)

Also, btw, I am assuming the common currency (whenever it happens, IF it happens) is at the central bank level. I am assuming the countries don't want to give up the sweet, sweet, mistress of seigniorage. I haven't heard anything otherwise.

Though, i guess there are ways to do it where economically stronger nations try to keep that, (the Euro tried to do this) though, i feel the Euro was a cautionary tale, with the average Netherlands citizen contributing €284 per capita and the average Lithuanian taking €578 per capita. (As of 2018) (Or Luxembourg at €2,710 per capita due to all the institutions within its borders.) https://www.visualcapitalist.com/which-countries-are-the-biggest-boost-or-drag-on-the-eu-budget/ Anyway, what I'm try to say is that it's really hard to have multiple countries with multiple standards of wealth come in and not get upset about one country 'carrying the load' and one country 'weighing them down' . Better keep it as a Central Bank level thing. Not a Citizen-level money.

Here's a description of what they (NDB) are in their own words: "The New Development Bank (NDB) is a multilateral development bank established by Brazil, Russia, India, China and South Africa (BRICS) with the purpose of mobilising resources for infrastructure and sustainable development projects in emerging markets and developing countries (EMDCs)."

(The currency, I did hear mentioned a month ago. Then more recently that it wasn't happening any time soon.)

My sources for NBD was Wikipedia BRICS article (lol.) And their official site.

Official Site: https://www.ndb.int

BRICS Wikipedia: https://en.m.wikipedia.org/wiki/BRICS

Here's an article from the Washington Post I Un-paywalled about it in 2014: http://web.archive.org/web/20230509021522/https://www.washingtonpost.com/news/monkey-cage/wp/2014/07/17/what-the-new-bank-of-brics-is-all-about/