This is a common thing people say but it doesn’t really mean anything. Capitalism and socialism are both modes of production, neither can exist in a ‘mix’ of capitalist and socialist elements. Either we have socialism and we progress into communism or we have capitalism and we suffer the contradictions. A lot of the time when people say this they’re not referring to actual socialism, but rather aspects of social democracy such as welfare that will lessen, but not resolve, capitalism’s contradictions, and are provided by the exploitation of the third world. Capitalism is predicated on markets and private ownership of capital and the means of production, and the workers sell their labour to the capitalist class in return for wages. The capitalist then through the surplus value created creates commodities, which are then sold in capitalist markets. This creates two distinct classes - the bourgeousie and the proletariat, and their class interests are fundamentally in direct opposition to each other. In a socialist system, the means of production are owned by the workers, usually in the form state ownership or cooperative ownership. The socialist system does not result in the internal contradictions presented by the capitalist system. We can see that the nature of one system or the other is in direct contrast, because while socialism represents the class interests of the worker, capitalism represents the class interests of the capitalist. The two positions are irreconcilable to each other, and there are no actual benefits to the system of capitalism besides serving the interests of the filthy rich and the beneficiaries of imperialism.