19.5 End-of-Chapter Material


  1. Demography is the study of population. It encompasses three central concepts: fertility, morality, and migration, which together determine population growth. Fertility and mortality vary by race and ethnicity, and they also vary around the world, with low-income nations having both higher fertility and higher mortality than high-income nations.
  2. The world’s population is growing by about 80 million people annually. Population growth is greatest in the low-income nations of Africa and other regions, while in several industrial nations it’s actually on the decline because birth rates have become so low. The world’s population reached 6.8 billion by the beginning of the 21st century and is projected to grow to more than 9 billion by 2050, with most of this occurring in low-income nations. The annual rate of population growth will decline in the years ahead.
  3. Thomas Malthus predicted that the earth’s population would greatly exceed the world’s food supply. Although his prediction did not come true, hunger remains a serious problem around the world. Although food supply is generally ample thanks to improved technology, the distribution of food is inadequate in low-income nations. Fresh water in these regions is also lacking. Demographic transition theory helps explain why population growth did not continue to rise as much as Malthus predicted. As societies become more technologically advanced, first death rates and then birth rates decline, leading eventually to little population growth.
  4. Urbanization is a consequence of population growth. Cities first developed in ancient times after the rise of horticultural and pastoral societies and “took off” during the Industrial Revolution as people moved to be near factories. Urbanization led to many social changes then and continues today to affect society.
  5. Sociologists have long been interested in the city and have both positive and negative views of urbanization and city life. Contemporary research supports Wirth’s hypothesis that tolerance for nontraditional beliefs and behaviors will be higher in urban areas than in rural areas.
  6. Cities continue to face many problems. Among the most serious of these problems are residential crowding, substandard and racially segregated housing, heavy traffic and great amounts of air pollution, and high crime rates.
  7. Rural areas face many challenges that result from their sparse populations and the great distances that people must often travel. Among other problems, rural areas have a lack of economic opportunities in today’s information age and a general lack of various kinds of human services.

Using Sociology

After graduating from college, you are now living in a working-class neighborhood in a fairly large city. You enjoy the excitement of the city, but you are also somewhat troubled by the conditions you have noticed in your neighborhood. One problem that has come to your attention is the existence of lead paint in some of the buildings on your street and adjoining streets. Despite being ordered some time ago to remove this paint and repaint their buildings, four landlords have not yet done so, and the issue is slowly making its way through the courts. Angered by the situation, a new group, Parents Concerned About Lead Paint (PCALP), has hung up flyers announcing a protest rally planned for Saturday of next week. Although your own building has no lead paint and you are not (yet) a parent, you sympathize with the goal of the protest, but you were also planning to visit a friend of yours out of town on the day of the protest. What do you decide to do? Why?


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