How to tell if it options were bought instead of sold

Quote from adamchubb:

also, option buying is more for speculation purpose.

Can you back that statement up with evidence please.

when people think a stock is going to make a big move on the upside, they would rather buy call option than sell put. the same is true in the other direction.

What if they buy stock and puts?
 
Quote from darwin666:

but that doesnot make sense. .as if the stock collapses. what do they do ?.. take infiinte losses... MMs , I just dont get it. how they make the markets and live off it consistently..~!

If you're trading options, try to understand synthetics first. For your example, read about "conversions" and "reversals".
 
I think what the Original Poster is referring to is articles that talk about buying to increase open interest, as opposed to buying in the market and therefore not having a seller open a new position.
 
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