Most countries today operate under which of these economic systems? a. participatory economy b. command economy c. mixed economy d. free market economy

The third alternative is correct (C).

Almost any type of nation can have a mixed economy. A mixed economy mixes elements of private initiative and collective economic action, through government action. Most countries operate in mixed economies, including the US.

A mixed economy is one in which the assumptions of the free-market economy operate, but with some interference from the government aimed at ensuring general well-being. This is done through regulation or direct action through state-owned enterprises.

your answer is rising unemployment and inflation.