In a economy, a central authority determines who buys goods and services. in a economy, price determines who buys these products.

a) planned , market
b)market , planned

A. Planned, Market

Explanation:

In a Planned economy, a central authority determines who buys goods and services. In a Market economy, price determines who buys these products.

In Planned economy, a central authority determines production and distribution of goods and services while in Market economy. the production, distribution and regulation of prices is determined by demand and supply of goods and services in the market.

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