Final answer:
According to Karl Marx, the relationship between economic power and state power is that the state serves the interests of the capitalists and acts as a tool for oppressing the working class.
Step-by-step explanation:
According to Karl Marx, there is a close relationship between economic power and state power. Marx argued that under capitalism, the state serves the interests of the capitalists and acts as a tool for oppressing the working class. The capitalists, who control the means of production, use their economic power to influence and manipulate the state to maintain their own power and wealth.