First of all, what is luck?Yeah? I googled it but it's good, I think. I'm especially positively surprised the definition included the bolded part, because chance is something that arguably doesn't exist except in our own heads. Logically you could argue that every odds is either 0 or 100 as they both mean "certainty", and whatever outcome that future has is certain. That it either rains tomorrow or it doesn't, and with a proper analysis you'll be able to determine which one it is 100 %. Determinism.Success or failure apparently brought by chance rather than through one's own actions.
But yeah, let's continue assuming that chance is real, even if only based in our own imagination.
Logically, if you flip a coin 10 times, the chances for heads and tails being approximately 50 % -- let's call that the "equilibrium state of chance" -- is actually not that high (5-5 is closer to 25 % chance if I've calculated correctly), but the more coins you throw, the closer to 50 you will get. Technically, you're going through billions of coin tosses a day, which means that odds-wise, people are approximately equal as far as chance is concerned overall.
Yet the world hardly seems that fair, right? There are people calling themselves "lucky" and "unlucky" with good reasons, after all. I think we can agree that the sole determinable factor is the reward. Maybe you will encounter the same complete stranger 10 times during the day in 10 completely different places in a huge city, but what does that matter to you? Will you even notice? In comparison, if you beat the same odds in a lottery, you'd be rich. Big difference in terms of reward.
I guess you could say that "bad luck" is about hitting heads with the wrong coins in that aspect and vice versa. Still, I want to note that most of "bad luck" is actually just "bad attitude".
Maybe you beat the bad odds today and stepped into dog shit. You could either analyze exactly how unlikely that is and scream inside at how unlucky a person you are, or you could think "Thank goodness I was just taking a stroll. If I had somewhere to be, it would be a disaster. Good excuse to wash my shoes properly this time, anyway." For some reason, "Unlucky people" continues being unlucky, and I don't think that's very strange because their attitude encourages it.
Basically, luck and bad luck is in our heads, because rewards can be mentally altered as they're subjective. Even chance is hardly real and can be overturned by good intuition. Naturally, there are instances such as "getting cancer" etc. that is hard to predict, prevent or even see the bright side of, but even that is just because of our own inability to cope. Even (perhaps especially) cancer patients must learn to be positive. Even if it means certain death, you don't wanna go out with a whimper. Good attitudes are about increasing the subjective reward of the coin tosses that actually did go well for you, after all.
... that's my thought for the day, anyway.