BRICS+ countries should press ahead with a joint cross-border payments mechanism to reduce reliance on the US dollar, but a shared currency would face major economic ​and institutional obstacles, a think tank report said on Friday.

The paper, published ‌by non-profit policy platform BRICS+ Thinking, urged the expanded grouping of major emerging economies led by Brazil, Russia, India, China and South Africa to commit to such a mechanism and take the steps ​needed to make it work.

“It is absolutely crucial that their central banks embrace ​this goal and make sure that all the technical requirements are put ⁠in place to allow this mechanism to function,” said authors Gregory T. Chin, Danny ​Quah and Jim O’Neill, the former Goldman Sachs economist who coined the BRICS acronym.

Cross-border payments ​have long been on the BRICS agenda, though efforts to integrate members’ financial infrastructure have made limited progress.

In a declaration issued after their September summit in India, BRICS leaders said they would continue ​work on faster, cheaper cross-border payments, including by linking payment systems and increasing the ​use of local currencies.

Introducing a shared currency, meanwhile, would require “dramatic reforms” across the group, including greater central ‌bank ⁠independence, a common monetary authority and fewer restrictions on capital flows.

“The initial prognosis for the possibility of a BRICS+ currency is not hopeful,” the authors said, adding that it would have to be freely convertible both domestically and internationally, a difficult requirement under current ​policies.

“This is daunting enough ​but further significant ⁠challenges include how these countries are geographically dispersed and how they show no enthusiasm for delegating policy autonomy to a common central ​bank.”

The prospect of a BRICS currency has drawn criticism from US ​President Donald ⁠Trump, who has repeatedly threatened 100% tariffs on member states if they create a common currency or back an alternative to the US dollar.

BRICS does not have a common currency, ⁠and members ​including Russia and India have played down the prospect. ​However, efforts to reduce reliance on the dollar have gathered pace globally since Western sanctions were imposed on ​Russia following its 2022 full-scale invasion of Ukraine.