A major assumption of Keynesian social welfare is a. Marxism is theoretically sound and empirically demonstrated in real-life situations b. That capitalism is self-sustaining and requires very little government oversight or intervention c. That the early neoliberalism of Walter Lippman's generation was fundamentalist and rigid d. an expanding welfare state is made possible by perpetual economic growth, itself enabled by consumer demand, increased production, more jobs, corporate profits, higher wages, and the government taxing those profits and wages