How future's quota is determined

#1
Hi gurus, I know that many of you are most experienced and technocrats pertaining stock market.

I have a few doubts, could you please clarify that. How the quota of futures affect the common pool of shares, is there a fixed quota or it is floating.

Assume that if many of traders sell/buy a large quantities of shares in futures, how it will affect general shares, will the general share value moves according to future's action or it is relatively immune to general shares.

Thanks in advance.
 

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