What term refers to a system where all economic and social activity is controlled by a single political party?

The term that describes a system where all economic and social activity is controlled by a single political party is communism. In a communist system, the government typically owns and regulates the means of production and distribution of goods and services, with the goal of achieving a classless society where resources are shared equally among the population. This central control by the political party is a key characteristic of communism, distinguishing it from other systems.

Democracy refers to a form of government in which power is vested in the people, who exercise that power directly or through elected representatives, and does not imply control by a single party. Capitalism is an economic system characterized by private ownership of the means of production and where prices are determined by supply and demand in a free market, allowing for multiple competing entities. Marxism is a broader socio-political and economic theory that critiques capitalism and advocates for a revolutionary approach to create a classless society, but it does not directly refer to the overall system of governance like communism does.