"after a string of red, black is more likely" people

Happens to be true for sampling from a finite set without replacement :-P

The very basics of probability. I'm talking to the level of "there is about a 1 in 6 chance of a reasonably fair dice coming up 3 on a single roll"

I remember a friend telling me about a game some of his classmates played which was basically about calling high/low on the next card dealt.

He'd made a modest and steady income simply calling based on whether it was greater or less than 7 for the first few cards and he was known as being "lucky". They honestly couldn't comprehend something as simple as that.

Would someone be able to enlighten me on what the cons of a hypothetical situation in which everyone on the planet decides to temporarily get rid of the concept of money or currency, and pool our collective resources and ideas without worrying about who owes who? I mean on paper it sounds great, and obviously this is extremely hypothetical as it's virtually impossible to get all human life on Earth to actually do that, but are there hidden cons here that I'm not really seeing?

I've not really gone into too much thought on this, it was mostly a fleeting thought, and I was curious what others thought.