Economic growth is just easy to check data.
That's debatable but ok.
Generally markets and competition do well in figuring out how to do something we don't know how to do well and cheap. Once we figure that out for some product or category, profits fall competitors fail and consolidation sets in, cost of production falls further due to decreasing duplication and increased scale.
Absolutely yes.
A sector that hasn't been relaxed for example is banking and for a good reason.
Yes, very good reason.
But beyond relaxing control, the other very important thing that was relaxed was foreign direct investment.
So the other big part of capitalism.
On Walmart, I think what you're looking at is the feedback mechanism of shop/factory data going up the stack.
I think this comes back to what you said before. If we are talking about established items, that you already have suppliers for, then you can centralize it.
But good luck getting beer from a small local brewery stocked. The more centralized, the less flexible and innovative.
Imo if you centralize on a scale of an entire national economy, you would have very hard time dealing with anything that's not a well established supply line already.