No, if you re-read it, I implied that the market cap could be lower or higher. The car example said that either you have more buyers than you need, or less buy

No, if you re-read it, I implied that the market cap could be lower or higher. The car example said that either you have more buyers than you need, or less buyers than you need. You would end up with less than, or more than $1 million dollars, but it's unlikely you'd end up with exactly that amount. Indeed an open-market acquisition is a good indicator of the value of the company - the value of anything being what someone is willing to pay for it.