Just look at Venezuela. Private industry becomes nationalized, therefore competition is killed, therefore incentive is killed, therefore innovation is killed, therefore the economy stagnates, then crumbles. More entities are nationalized to attempt to stop the economic downturn, and things get worse. Do you know that there are daily brownouts there to conserve electricity? It wasn't always this way.
Socialism eradicates competition and rewards those who work less, rather than those who work more.
There are no success stories of socialist economies.
Name one innovation that came from socialist environment... Can't think of one? Okay, think of an innovation that came from a capitalist environment.... Not so hard, is it?