History

What is the definition of Capitalism according to Marx
Capitalism according to Karl Marx is the social relationship founded upon on voluntary wage labor. According to him, capitalism is an economic system where the capitalists assume economic control in the society. This society is differentiated by an exceptional wage-labor relationship by which an excess labor is brought into existence by a non-laborer without direct force. Human beings, on the other hand, trade their labor in the market. The capitalist buys labor from the market. In his writings, he argued

Capital is money, capital is commodities.... By virtue of it being value, it has acquired the occult ability to add value to itself. It brings forth living offspring, or, at the least, lays golden eggs (Marx, 1848).

What is wrong with capitalism, according to Marx
Capitalism according to Marx would certainly create internal tensions which would lead to its own destruction. He also reiterated that the socio-economic change occurred through an organized revolutionary action in a Capitalist type of government. Thus, according to him capitalism should end by a virtue of organized working actions of an international working class. In one section of The Communist Manifesto, he described capitalism together with feudalism as

We see then the means of production and of exchange, on whose foundation the bourgeoisie built itself up, were generated in feudal society. At a certain stage in the development of these means of production and of exchange, the conditions under which feudal society produced and exchanged...the feudal relations of property became no longer compatible with the already developed productive forces they became so many fetters. They had to be burst asunder they were burst asunder. Into their place stepped free competition, accompanied by a social and political constitution adapted in it, and the economic and political sway of the bourgeois class. A similar movement is going on before our own eyes.... (Marx, 1848).

What is the role of the working class in capitalism, according to Marx
Marxs idea of working class (proletariat) is defined as ones relationship to the means of production (individual position in the structure which is purely characterizes by pure capitalism). A good example of this, according to him, is in the process of a factory producing company such as widgets (imaginary commodity). Some of the money collected from selling the product will be spent in producing machinery and raw materials to create more goods (constant capital). On the other hand, some of the money will be spent on labor (variable capital). In return, the capitalist will not continue their business so long as there is an excess value of produced goods (money beyond the constant and variable capital). Thus, the amount of this surplus value (profits, interest and rent) greatly depends on how much labor workers do for the wages. In this sense, the working class should be the benefited most, not the capitalist. Thus, he wrote,

Capitalist production, therefore, develops technology and the combining together of various processes into a social whole, only by sapping the original sources of all wealth -- the soil and the laborer (Marx, 1848).

Why would this type of system change, according to Marx
He believed that this kind of system (Capitalism) need to be changed (Capitalism) since social relationships of production (workers and capitalist) through commodities are both sold in the market. For him, one need to give up on the its own labor to prevent alienation. He described this loss as commodity fetishism, in which all the things that people create, like commodity have a life and movement of their own to which man merely adapt its behavior.  Thus he said describe in one of his paper

A spider conducts operations that resemble those of a weaver, and a bee puts to shame many an architect in the construction of her cells. But what distinguishes the worst architect from the best of bees is this, that the architect raises his structure in imagination before he erects it in reality (Marx, 1848).

Future economic system according to Marx
According to Marx the future of economic system is Communism, which is usually associated with socialism that is a wide sector of economic and political philosophies. This idealism according to Marx, attempted to give an alternative solution to the prevailing problem with the capitalist. He reiterated that the only way to solve this problem is for the working class (who produces the goods and wealth to society) to replace the capitalist-class in able to obtain a free society. In this sense, the economy would function as an economic system that would consist of common ownership by the means of production and eradicating the concept of private ownership. Marx said
You are horrified at our intending to do away with private property. But in your existing society, private property is already done away with for nine-tenths of the population its existence for the few is solely due to its non-existence in the hands of those nine-tenths. You reproach us therefore, with intending to do away with a form of property, the necessary condition for whose existence is the non-existence of any property for the immense majority of society The theory of the Communists may be summed up in the single sentence Abolition of private property (Marx, 1848).

What is the role of the workers in the system according to Marx
His theory of the role of workers in the Communist system particularly submits to the separation of things that are normally fit in with each other. This concept he said as most important referring to social alienation of people from their human nature. According to him, this concept would automatically results to capitalism. This is founded upon by his observation under the emerging production of capitalism. According to him, workers should never be autonomous in such a way that the capitalist-class would want their workers to behave. This phenomenon exists, since capitalist contributes wealth and can express their fundamental social aspect of individuality. Thus, through a production system (not privately owned) individual functions as a social being and not as an instrument and Marx narrated

Let us suppose that we had carried out production as human beings. Each of us would have in two ways affirmed himself and the other person. 1) In my production I would have objectified my individuality, its specific character, and therefore enjoyed not only an individual manifestation of my life during the activity, but also when looking at the object I would have the individual pleasure of knowing my personality to be objective, visible to the senses and hence a power beyond all doubt. 2) In your enjoyment or use of my product I would have the direct enjoyment both of being conscious of having satisfied a human need by my work, that is, of having objectified mans essential nature, and of having thus created an object corresponding to the need of another mans essential nature. ... Our products would be so many mirrors in which we saw reflected our essential nature (Marx, 1848).
Your analysis (personal point of view) of how valid is Marx.

The evidence of Marxs idealism is incompatible with today social consciousness together with the practical application of his theories. This philosophy of Marx failed to achieve anything. This is for the reason that the incompatibility between man and its environment together with its current state of evolution will never be fir with his philosophies. In this sense, nature of man will never be compatible with communism and will never be a viable philosophy.