Why do governments use tax money to supply public goods and services, instead of selling them to those people who use them?

Public goods and services are just that: public--meaning they belong to all citizens. If the government were to sell these services only to those who needed them, only the relatively rich would benefit.

Z-gadgets has developed a mini-laptop that will be marketed in developing countries. it is estimated that the requirement for the new product will start out slow and accelerate as the product becomes increasingly familiar to worldwide consumers. to begin to staff the new production facilities, the company should conduct a(n):   demand forecast