Urbanization, Supply, Migration, Demand, Trade Barrier, Market Economy, Command Economy, Economics 1. ________________ is the amount of a good or service that is available for use. 2. ________________ is the movement of people from one place to another (like birds). 3. An economy where individuals make the choices is a __________________________. 4. _________________ is the study of how people meet their wants and needs. 5. A _________________________ is an economy where the government makes the choices. 6. The desire for a particular good or service is _________________________. 7. A ______________________________ is a barrier to trade. 8. ____________________________ is the growth of cities. 9. 10.