Capitalism is based on individual initiative and the use of market mechanisms rather than government intervention.
Socialism is based on government planning and limitations on the private control of resources.
In reality, there are very few, if any, purely socialist countries or purely capitalist countries. Most, if not all, countries have elements of both systems.
Saudi Arabia is not a democracy but neither is it a socialist country. Even though its human rights record is appalling for both women and foreign workers, other democracies are quite happy to do business with it.
The Philippines is a democracy that works on capitalist principles but has an appalling human rights record.
Just as calling a country "socialist" does not necessarily mean it operates fairly and in the interests of all its population, neither does calling a country a capitalist democracy guarantee fair treatment.
Some countries, whilst maintaining a mixed economy, have endeavoured to create a sense of balance using taxation as a means of narrowing the gap between the very rich and the very poor, with the state retaining control over or strict regulation of vital national resources and public services.
Unfortunately capitalism in its purest form is predicated on the market being king and the laws of supply and demand being sufficient to regulate it. Competitors seek to earn the most profit by selling their goods for as much as they can while keeping costs low. On such a basis, there is little regard for whether the goods in question are necessary or ethical, how the profit is earned, by whom and who it benefits. Ultimately, without principled state intervention, I believe it will mean a global "race to the bottom" which will benefit nobody but the super rich.
In 2014 Will Hutton discussed an article in The Observer detailing an interview with Thomas Piketty. Piketty's highly acclaimed book sets out his argument that "the current level of rising wealth inequality, set to grow still further, now imperils the very future of capitalism".
An extract explaining this conclusion:
"Anyone with the capacity to own in an era when the returns exceed those of wages and output will quickly become disproportionately and progressively richer........ Our companies and our rich don't need to back frontier innovation or even invest to produce: they just need to harvest their returns and tax breaks, tax shelters and compound interest will do the rest.......
"Capitalist dynamism is undermined, but other forces join to wreck the system. ........ progressively, the proportion of the total tax burden shouldered by those on middle incomes has risen. In Britain, it may be true that the top 1% pays a third of all income tax, but income tax constitutes only 25% of all tax revenue: 45% comes from VAT, excise duties and national insurance paid by the mass of the population.
"As a result, the burden of paying for public goods,such as education, health and housing is increasingly shouldered by average taxpayers............ Wealth inequality thus becomes a recipe for slowing, innovation-averse, rentier economies, tougher working conditions and degraded public services."
www.theguardian.com/commentisfree/2014/apr/12/capitalism-isnt-working-thomas-piketty