The country is set to move from 13th place last year to 10th among countries with the highest number of people earning more than $20 a day (based on 2011 purchasing power parity).
China is likely to retain its position at the top of the list for the next eight years, followed by India, the U.S. and Indonesia.
Vietnam, along with Bangladesh and India, is expected to see the greatest increase in consumer spending this decade (2021-2030).
The country’s upper-middle income group (those who earn $50-110 a day) is set to grow by 17% annually from now through 2030.