The rich nations have already signed agreements to purchase over 1.3 billion doses of COVID-19 vaccines, Bloomberg reported referring to the data from Airfinity analysts.
The list of countries includes the US, the UK, Japan, the EU.
According to analysts, they intend to buy another 1.5 billion vaccines thanks to supplies and deals that have not yet been closed.
Experts fear that this aggressive buying will endanger other countries that may be the last in line to purchase the vaccine.
The US and UK have struck a deal with Sanofi and GlaxoSmithKline Plc, and Japan - with Pfizer, the article noted.
"The possibility wealthier countries will monopolize supply, a scenario that played out in the 2009 swine flu pandemic, has fueled concerns among poor nations and health advocates," authors said.