If you talk about developed countries or the developed world, you mean the countries or the parts of the world that are wealthy and have many industries. 发达的
adjective [原级]发达的,高度发展的;先进的,成熟的;人体成规定比例的
This scarcity is inevitable in less developed countries. 在欠发达国家这种匮乏是不可避免的。