For people who do their homework, it is never a gamble.
How about 'the butterfly effect' and 'chaos theory' ? No matter how prepared you are, you are never 100% sure.
That kind of questions makes me think that most people here are just high schoolers.
For you guys making any kind of investment is a gamble.
Why do I think you are a high schooler? You could have said, "how about risk and uncertainty", but no, you have to jump all the way to terms that are way out of topic, but common to find in youtube.