Cassandra was cursed by the gods that her prophecies would always be correct, but that no one would believe her.
Here's what freedom can and cannot do. If there had been a stock market at the time, Cassandra could have shorted Trojan enterprises and made a fortune. However, she might have been killed by Clytemnestra anyway, unable to enjoy her gains.
I have stories about the play which I have bored my two older sons with too often, so you shall be spared them.