Federal, state, and local agencies that buy products and services for the constituents they serve are referred to as: Government units.
Government units is a department or agency which duties is to buy products or goods and serve for the constituents they belongs.
The government units main purpose is to supply goods and services and to ensures that constituents which they serve needs are met.
Therefore Federal, state, and local agencies that buy products and services for the constituents they serve are referred to as: Government units.
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