Democracy and socialism lead to rising social and institutional time-preferences; people that can produce more wealth end up with less wealth (because the state collects it). The result is a shrinking ability for those with the skills to build capital to invest long-term, and a decline in overall capital for everyone, since the capitalist can pay less workers, and the state has progressively less and less to collect from taxes. Technological progress slows, poverty increases, and IQ drops. Eventually civilization ends and humans revert to barbarism.
In
capitalism, those who produce more wealth (i.e. the workers) end up with less wealth because
the capitalists collect it (surplus value). Thus a capitalist can earn thousands or millions of times as much as a hard-working person.
In socialism, there's no such thing as capitalists. Instead companies are collectively owned and their produced wealth may be spent on the population as a whole (e.g. in the form of universal education, welfare...) or higher wages for the local workers, employing more, expanding the industry, ... The fact is, however, since there is no longer this parasitic class of capitalists taking big parts of the wealth, there's more wealth to give back in reward to the workers. Thus those who produce more wealth end up with
more wealth in socialism.