I came to realize that capitalism is really good at doing the one thing socialism is really bad at: creating a learning process to help people figure stuff out. If you want to run a rental car company, capitalism has a whole bevy of market and price signals and feedback loops that tell you what kind of cars people want to rent, where to put your locations, how many cars to order. It has a competitive profit-driven process to motivate you to learn and innovate, every single day.
Socialist planned economies — the common ownership of the means of production — interfere with price and other market signals in a million ways. They suppress or eliminate profit motives that drive people to learn and improve.
It doesn’t matter how big your computers are, the socialist can never gather all relevant data, can never construct the right feedback loops. The state cannot even see the local, irregular, context-driven factors that can have exponential effects. The state cannot predict people’s desires, which sometimes change on a whim. Capitalism creates a relentless learning system. Socialism doesn’t.