What is the role of the government in a mixed economy?

In a mixed economy model, firms have the autonomy to produce and market goods and services, as occurs in the market system, but the state also has the pre-extension of producing and marketing, as it does in the planned system. Thus, the mixed economy model is a mix between the planned model and the market model. In addition to being able to produce, the state must also act as a regulator of the economic system to ensure that the environment is prone to the development of capitalism. Thus we can say that the role of government in a mixed economy is one of producer and regulator. Almost all capitalist economies are to a greater or lesser extent mixed economies, including the US.

because he was a christian?

i think it is the third one.