I love how tankies seem to think the only economic system apart from communism is capitalism. We have fascism with the Nazis and mercantilism with British colonial territories, but somehow it's all capitalism because it lets them pretend to win arguments without needing to actually learn how different economic systems work.

Capitalism means private ownership of the means of production. There are many ways to organize capitalism, but this is its essential feature.

Likewise, there are many ways to organize socialism, where the means of production are owned collectively. Some may more more desirable than others. There have been fewer experiments with socialism than capitalism, and those that have existed have some good features and some bad features.

There are some good features to capitalism, but it has long exhausted its progressive character. For example, its good at producing lots of consumer goods. Its weaknesses are an inexorable drive to imperialism, the subjugation of the working class, and a kind of environmental death drive where it can't stop itself.