Answer:
Private sector through the earning and spending.
Explanation:
Market economy is an economic system whereby, basic economic decision like pricing are determined between businesses and individuals. These basic economic decisions also occur because prices of goods and services are set up due to forces of demand and supply.
In a market economy, individuals owned resources hence decisions to allocate them are determined by individuals, businesses or private sector instead of government.
Therefore, a given mixture of goods and services to be produced and redistribution of output in a market economy is determined by Private sector through the earning and spending.