Final answer:
The important socioeconomic dimension mentioned in the text is the increase in the elderly population in developed countries, leading to greater demand for health care and related services.
Step-by-step explanation:
According to the text, an important socioeconomic dimension is the increase in the number of elderly in developed nations, which suggests a higher demand for age-related goods and services, such as nursing homes and hearing aids. This shift in demographic makeup signifies a rise in the proportion of elderly citizens, which the U.S. Census Bureau projects will reach 20% by 2030. Contrary to the options presented, this change implies an increased demand for health care, not a reduction. The text also dismisses the scenarios of an increasing birth rate in most developed nations, a decreasing number of working women, an urban-to-rural shift impacting housing demand, and a decrease in the number of working women as the primary socioeconomic dimensions being discussed.