1) communist countries usually have economies.
(a) command
(b) mixed market
(c) market

(A) command

Explanation:

Planned: A planned economy occurs when the state is the owner of the means of production, so it is up to the government to decide the quantity of production and the price. In this model, there are no private companies or competition.Therefore, in a flat economy the state is the sole producer and supplier of goods and services. This type of economy is common in closed countries that have communist regimes, such as North Korea.

the use of electrical signals that transit messages is know as

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