Capitalism is synonymous with democracy

First past the post is bad for capitalism because the two main parties have little incentive to withdraw from the market. The main parties are both socialist and like to intervene in the market ostensibly to help the poor but in reality to help themselves. Socialism (defined by government spending) is nothing more than an excuse for the government to enrich themselves. If not for socialism the poor would be much better off because the government would have less of a reason to obstruct their natural economic progress... and withdraw from the market in areas such as land and banking. Socialism is an excuse for the rich government to steal money from the population (including the poor) and if we do not have sufficiently efficient democracy it will flourish. The government will find it easier to steal money from people if we do not have a powerful enough democratic system which is why proportional representation is preferable. Pr prevents socialism which is why it is good for the poor and bad for the (relative) rich. Socialism is bad for the poor which is why pr is a better system of government. First past the post is bad for the poor because it stifles the market and enables socialism.