The given bar chart compares the average years of schooling, the number of scientists and technicians, and the expenditure on research and development between developing countries and industrialized countries.
In 1980, the amount of time students in industrialized countries spent in schools was more than 8 hours, which was 6 hours more than that in developing countries. By 1990, the figure for industrialized countries rose slightly to approximately 10 hours, while there was no significant change for developing countries.
The number of scientists and technicians per 1000 people in developed countries was 50 people, 5 times as many as that in developing countries, which was only 10 in 1980. These figures then both exhibited an upward trend in 1990. However, while the figure for advanced countries surged to around 85 people, the figure for low-income countries only increased slightly to 20.
Over the same period, the spending on research and development of the two groups showed an opposite trajectory. While the figure for industrialized countries experienced substantial growth from 200 to 400 billion, that for developing countries witnessed a considerable decline from 100 to 20 billion.