CCP determines drop rates and mineral requirements, but that does not mean CCP determines supply. We still need players to go out and mine and shoot rats. So CCP determines part of what is going on in the game. It is like how nature determines how much oil there is in the ground. Players are a pivotal role in the whole process. No players, no supply. No players, no demand.
If you are going to argue that CCP determines the total available veldspar in the game because they determine the number of asteroids and their content therefore they control the economy then we have nothing more to talk about really. You have an obtuse and blinkered view and ignore that there is actually a process where the players play the critical role.
Your view amounts to nothing more than arguing CCP has seeded resources, why they control the entire economy and interfere. The first part is true, the second part is not. There is no contradiction here. The players drive what happens in the market. Players determine demand, players determine supply and there are thousands, perhaps millions of player interactions that are at work. CCP has an important role in terms of seeding resources and setting the rules of the game, but once that is done they step aside.