This study argues, by contrast, that the transition from Keynesian to neoliberal economics has much deeper roots than pure ideology; that the transition started long before Reagan was elected President; that the Keynesian reliance on the ability of the government to re-regulate and revive the economy through policies of demand management rests on a hopeful perception that the state can control capitalism; and that, contrary to such wishful
perceptions, public policies are more than simply administrative or technical matters of choice - more importantly, they are class policies.
The study further argues that the Marxian theory of unemployment, based on his theory of the reserve army of labor, provides a much robust explanation of the protracted high levels of unemployment than the Keynesian view, which attributes the plague of unemployment to the "misguided policies of neoliberalism." Likewise, the Marxian theory of subsistence or near-poverty wages provides a more cogent account of how or why such poverty levels of wages, as well as a generalized predominance of misery, can go hand-in-hand with high levels of profits and concentrated wealth than the Keynesian perceptions, which view high levels of employment and wages as necessary conditions for an expansionary economic cycle. 
Deeper than 'Neoliberal ideology'
The questioning and the gradual abandonment of the Keynesian demand management strategies took place not simply because of purely ideological proclivities of "right-wing" Republicans or the personal preferences of Ronald Reagan, as many liberal and radical economists argue, but because of actual structural changes in economic or market conditions, both nationally and internationally. New Deal- Social Democratic policies were pursued in the aftermath of the Great Depression as long as the politically-awakened workers and other grassroots, as well as the favorable economic conditions of the time, rendered such policies effective. Those favorable conditions included the need to invest in and rebuild the devastated post-war economies around the world, the nearly unlimited demand for US manufactures, both at home and abroad, and the lack of competition for both US capital and labor.