Actually, let's go through this.
They fuel a lot of the growth in the world economy unlike other undeveloped countries that are kind of stagnating and more developed economies that are growing but at a slower pace. That is the reason they are grouped not because they are the next "super powers" or some such nonesense.
It's not just about growth. It's the fact they'll dominate too.
Select quotations from the wikipedia article [http://en.wikipedia.org/wiki/BRICS#.282003.29_Dreaming_with_BRICs:_The_Path_to_2050]:
He also stated that the BRICS demonstrate that the five emerging economies are emerging as a defining force to shape the new international political and economic order.
Goldman Sachs argues that the economic potential of Brazil, Russia, India and China is such that they could become among the four most dominant economies by the year 2050. The thesis was proposed by Jim O'Neill, global economist at Goldman Sachs. These countries encompass over 25% of the world's land coverage and 40% of the world's population and hold a combined GDP (PPP) of 18.486 trillion dollars. On almost every scale, they would be the largest entity on the global stage. These four countries are among the biggest and fastest growing emerging markets.
Goldman Sachs has argued that, since the four BRIC countries are developing rapidly, by 2050 their combined economies could eclipse the combined economies of the current richest countries of the world. These four countries, combined, currently account for more than a quarter of the world's land area and more than 40% of the world's population.
In the revised 2007 figures, based on increased and sustaining growth, more inflows into foreign direct investment, Goldman Sachs predicts that "from 2007 to 2020, India's GDP per capita in US$ terms will quadruple", and that the Indian economy will surpass the United States (in US$) by 2043. It states that the four nations as a group will overtake the G7 in 2032
According to a new report from Goldman Sachs, China might surpass the US in equity market capitalization terms by 2030 and become the single largest equity market in the world. By 2020, US GDP might be only slightly larger than China's GDP. Together, the four BRICs may account for 41% of the world's market capitalization by 2030, the report said.
Just FYI: At least start 1L before posting in this forum. Over and out.