To balance imports and exports. To balance the government's budget. To make the best use of scarce resources. To save money to reduce the national debt. The economic wants of people in any society are virtually limitless.
Private enterprise has to produce it rather than the government.
There has to be less production of other products. There has to be a general decrease in prices. To produce more of any one product, some resources must be shifted away from the production of another product when a nation's human and material resources are being fully and efficiently used. This illustrates the problem of economizing, always faced when resources are limited. Increased price inflation.