Emini movement- underlaying corps?

Hello, I would like to know that, if Im buying in emini and theres no liquidity it could affect price isnt it?. But how is that possible, if price on emini is determined by the underlaying movement of corps in sp500?

Example, Ibex35 depends on the corps like BBVA, Santander.....
 
It's the same market. Think of the emini bids and asks and the collective bids and asks for the stocks in the S&P 500 as being a single market, a single entity. If they get decoupled, it's like a crossed market (bid > ask), and somebody fast is going to do the abitrage and take the risk-free money.
 
Hello, I would like to know that, if Im buying in emini and theres no liquidity it could affect price isnt it?. But how is that possible, if price on emini is determined by the underlaying movement of corps in sp500?

Example, Ibex35 depends on the corps like BBVA, Santander.....[/QUOTE

You're not going to affect its price movement unless you're trading hundreds to thousands of contracts during prime market hours or at least a couple hundred contracts during slow market hours( like during asian session)
 
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