Overpopulation. Crowding in cities. Human ecology. Now these issues can be dynamically studied in simulations of how different demographic factors influence human population size and growth. With DemographyLab students investigate how differences in population size, age-structure, and age-specific fertility and mortality rates affect human population growth. Default values for seven countries have been incorporated into the program to allow comparisons across different nations. The default values can be altered to conduct "what if" experiments. Phenomena such as the exponential growth and decline of populations, stable age structure, zero population growth, demographic momentum, dependency ratios, sex ratios, and marriage squeezes are revealed in dynamic charts and tables.

The purpose of this laboratory is to:

• Demonstrate fundamental primary demographic factors that influence human population size and growth.

• Simulate the effects of demographic factors on human population growth.

• Use demographic models to predict future changes in human population growth.