The phrase "a rapidly developing country" is correct and usable in written English.
It can be used to describe a nation that is experiencing significant economic growth and improvement in various sectors.
Example: "Vietnam is often cited as a rapidly developing country, with its economy expanding at an impressive rate over the past decade."
Alternatives: "an emerging economy" or "a fast-growing nation".
In a rapidly developing country like Vietnam, a 'big-bang' all-at-once product development approach might just work, and other companies interested in entering or expanding within similar emerging markets should take note.
Although China is still a rapidly developing country, its advancing steel industry has been producing larger amounts of stainless steel than Japan since 2006 (International Stainless Steel Forum 2013).
In a rapidly developing country like China, society becomes more vulnerable to seismic hazards because of the relatively low preparedness for disasters in comparison with the high speed growth of economy and population accompanied by fast urban expansion (Zheng et al. 2015).
This blogger is no fan of the 24 hour news cycle, but coverage that lags years behind is problematic in such a rapidly developing country.
Chile is a rapidly developing country.
Smoking, drinking and cannabis use were common and clustered among adolescents of a rapidly developing country.
And in India the problem is not lack of laws - after all, India is a democracy and a civilised, rapidly developing country.
Indonesia is a classic middle power; it is a newly democratic and rapidly developing country with significant military and diplomatic capacities.
Cellphone makers are targeting first time buyers in India with low-priced handsets to gain market share in this rapidly developing country of a billion people.
In 1952, he moved to Colombia to be an economic adviser to that impoverished but rapidly developing country.
China is facing a growing water crisis due to climate and land use change, and rise in human water demand across this rapidly developing country.
