Final answer:
Developed nations are characterized by strong international trade in agriculture and manufacturing, substantial capital bases, accessible health care, and widespread educational opportunities, leading to a healthy, well-educated populace with high consumer spending and robust infrastructure.
Step-by-step explanation:
Most developed nations share the following characteristics: vigorous international trade, especially in agriculture and manufacturing; a large base of productive capital; access to health care and a wide range of health services; and plentiful educational opportunities.
These countries often enjoy high levels of consumer spending, which are associated with a healthy population characterized by low infant mortality rates and high life expectancy. Education systems are robust, leading to high literacy rates. Developed nations also experience steady levels of urbanization, a secure infrastructure, and higher productivity. In contrast, low-income countries may struggle with severe inequality, inadequate healthcare, poor education, and heavy reliance on agriculture.
Signs of an economically developed country include not only economic indicators but also demographic characteristics, such as an even distribution across age groups and immigration patterns that reflect job opportunities for a diversifying workforce.