Q.Critically examine Karl Marx's economic ideas — historical materialism, class struggle and the theory of surplus value.

Marx's economic ideas fit together as one connected argument about how capitalism works and where it leads.

Karl Marx (1818–1883) built the most comprehensive critique of classical/capitalist economics from within economics itself, presented chiefly in Das Kapital (Volume I, 1867). His analysis rests on three closely connected ideas.

Historical materialism is Marx's view that the economic organisation of production — who owns land, factories and capital, and who must sell their labour to survive — is the real foundation on which a society's politics, laws, religion and prevailing ideas are built, rather than ideas shaping economic organisation as earlier philosophers had assumed. On this view, history moves through a sequence of stages (such as feudalism giving way to capitalism) as the class that owns the means of production comes into conflict with the class that does not.

Class struggle is the specific mechanism Marx identified for how one economic stage gives way to the next: an intensifying conflict of interest between the bourgeoisie (capitalists, who own the factories, land and machinery) and the proletariat (workers, who own nothing but their own capacity to labour, and must sell it for a wage to survive). Marx believed the contradictions of capitalism — recurring economic crises, rising inequality, and the increasing size and organisation of the working class in factories — would sharpen this conflict until workers eventually overthrew capitalism and replaced it with a socialist system in which the means of production are owned collectively.

The theory of surplus value provides the specifically economic engine behind this prediction. Building on the classical labour theory of value, Marx argued that a worker is paid a wage covering only subsistence, but is required to work a full day during which the worker's labour creates value considerably greater than that wage. The difference — surplus value — is retained by the capitalist as profit. Marx treated this not as an occasional unfairness but as a structural, built-in feature of capitalism: competition forces capitalists to continually extract as much surplus value as possible, worsening the exploitation of labour over time and, in Marx's view, making capitalism ultimately self-destructive.

Critical assessment: Marx's framework offered a genuinely original way of connecting economic structure to social and political change, and his emphasis on class, inequality and the distribution of income between labour and capital continues to influence modern debates on wages, worker protection and inequality. However, his central predictions have not been borne out as he expected — capitalism did not collapse under its own contradictions in industrialised nations, in part because those nations developed welfare states, labour rights, and rising real wages that Marx had not anticipated; his labour theory of value has also been largely superseded in mainstream economics by theories based on marginal utility and scarcity (developed by neo-classical economists after Marx). Marxian economics is therefore best understood today as an influential critical tradition and a source of continuing insight into inequality and class, rather than as an accurate prediction of how capitalist economies would actually evolve.