Another way Marx's sheds light on gray subjects are his discussions on capitalism. Marx feels that capitalism is intrinsically flawed. The only way for the capitalist to succeed is not by getting an equal amount to what he has given, but instead by getting more than what he has given. Profit is the goal in capitalism. The capitalist must produce at an ever-increasing rate while keeping production costs down in order to stay viable.
Capitalism does breed innovation and competition.
In capitalism everything becomes a commodity. For the Proletariat their ability to work is their only commodity. The Proletariat must sell their labor power to the Bourgeois. The Bourgeois have the upper hand in this exchange because they can refuse any unfavorable conditions because the labor market is so large they can afford to be as selective as needed to better increase profits. The interests of the Bourgeois and the Proletariat always come into conflict.