It is needed to keep balance in a nation's economy, and between the economies of multiple countries. I should be able to purchase stock, and make a good return.
Ancient Greece introduced to them a democratic form of government.
Whilst Liberalism is founded on ideas of freedom, equality and liberty. Social Democracy is the best balance of freedom and equality because it promotes social justice in a capitalist economy and a liberal democratic view. Also, communism has, historically, a poor reputation for freedom and equality. For example, China and North Korea are current communist countries and Russia previously was a communist country after the Bolshevik Revolution in 1917.
