If I simplified things a lot, the problem with society is that there's absolutely no goodwill. No one wants to help unworldly, everyone's like: "You wanna something, you have to do something." Okay, that's justice. But... There's hardly any justice in the society!
I think money is extremely stupid concept, or at least I feel it so. What is it? It's a piece of metal or paper, absolutely useless. Like, practically. What can you do with money? Not everyone's dabbling metalcrafter like Urist. Then why is there? Why one of the mightiest things in this world is something without use? When it's power relies only and only on will of those around you, who for some reason back this concept. It's like if only reason for money was to fill, appease this greedy desire of mankind, that nothing is for free.
We should help each other unworldly. When we can't expect it from the others, sad it is, at least we should be better. Yeah, it's frankly horrible. I am not American, but I absolutely understand the problem. I'm glad I'm going to monastery. Can say farewell to lots of bullshits this society invented.
From the most ancient times, people have worked by some form of trade. The simplest form is bartering goods (Og give Thog hunk of meat for two spear), services (Og patch Thog's hut if Thog puts new handle on Og's spear), or a mixture (Og patch hut if Thog gives Og new spear). The problem with this is twofold. First, any large-scale barter becomes unwieldy due to the volume of goods or the intensity of labor .If Thog wants Og to build him a big new hut, he has to make many spears for Og (which Og likely won't need) or otherwise perform some equivalent service - which might be difficult to find. Second, and related, barter at this level involves goods that are
indivisible. - If Gurk has three cows, a bull, and one ewe, getting a ram is the obvious means to breed his flocks. Murk has a spare ram, and would like a cow. However, a cow is a much more valuable animal in multiple ways to a ram - besides giving milk and potentially meat, it is an excellent draft animal at need. Thus, Gurk won't want to trade the cow for the ram, because he would feel cheated by the deal.
This is where currency and credit come in. If Thog wants to get Og to build him a hut, he can simply give Og many beads (beads were a popular form of currency in Stone Age societies, because each one took a noticeable amount of labor to make (restricting supply), and they were pretty (giving people a reason to want them)). Og can then take those beads to the guy who cuts down trees and the guy who is good at finding good stone, helping him get the materials he needs to make more tools and buildings. Likewise, Gurk can simply sell his cow for a dozen beads, then give Murk 8 beads for his spare ram, or even sell his cow to Murk for a ram and four beads. Even at this early date, the concept of credit existed. It would be entirely plausible for Murk to tell Gurk "Here is ram, Murk owe Gurk four beads" and Gurk to accept this.
Over the course centuries, this evolved into the hard currency (restricted by the rarity of the materials) of decades past and the fiat money (restricted by the strength of the economy it represents) of today.