In the 21st century no can really say true capitalism or communism exist
, most of the world is now a "Mixed Economy" - a mixture of Public and Private Interest shaping and guiding the progress of human history. Many theories have come and gone some may stay till the end of time while other may constantly change and adapt to our changing environment. Seeing how lately a lot of attention is being given the well being of our planet we might just see some changes come about that may better our ways of living.