Money

why is it 'fucked'? why do you hate convenient way of trading things?

how large and complex was their society?

this is why everyone hates commies
explain which of my premises is wrong or go fuck yourself.

You can attempt to make arguments for money, but efficiency definitively isn't one of them. Mere personal exchange does not make up an economy and does not occur in a vacuum, and even if we were to imply that the rates of personal exchange by some alchemy reached the levels that would facilitate your claim for the necessity of money, better systems exist. Energy credits/certificates, labour vouchers, digital labour tokens, etc.. Money is an antiquated system.

How is rich people telling you what to do for money any different from the government just telling you what to do directly?

it's
Pareto-efficient, you mean.
They expect both to be better off, you mean. The swap is Pareto-efficient if both are well informed (usually the case) and there are no externalities (extremely unrealistic assumption). Example: I swap my money for somebody's guitar. Me and guitar guy are happy. Now I make music (or what I think is music) and you are my neighbor and very annoyed by that. The sound isn't louder than the legal limit, so you are screwed.
Currency was developed by the state starting from tax-in-kind systems. The basis of money is coercion and expropriation by the state.

OP is right. Theres nothing capitalist about producing some goods in your freetime as a sort of hobby and selling it at cost to your comrades. This sort of natural human behavior can and will exist in a socialist society, and labor vouchers won't stop it, it would just force people to barter with goods instead.

dont see the relevance

i didnt claim it was necessary, just inevitable and beneficial.

if you pay someone a labour voucher less than the value of their labour, they will eventually work out that they can request more for their services and be paid it, and so you will rend up with money replacing your labour vouchers.

>if you pay someone a labour voucher wage less than the value of their labour, they will eventually work out that they can request more for their services and be paid it
welcome to communism

If it is just natural and can't be stopped, why do you whine about interference? If it can be strongly reduced by regulations, how can it be part of human nature? You sound like someone who doesn't even believe his own words. Sad.

Its more that such activity wont be as common because people will be able to acquire the goods they need from a general store or the equivalent of one more conveniently. For niche objects however, this may be the case for a while (crafted personalized figures, drawings, etc.).

Define both of these. In what way is it inevitable when if it is superseded by a superior system, and in what way is it beneficial when it retains inefficiencies and is riddled with issues.
Excuse me what

Here are some good videos of money by Cockshott. They are short and I advise you watch them.
youtube.com/watch?v=RHmVfTIPlmM
youtube.com/watch?v=cI01-5zhwdA
youtube.com/watch?v=BQrEEdy_uwM

less than the value their labour would get in a market.
for example, a doctor is paid the same as a barber for one hour of his services.
he will work out that he could demand to be paid lots of good instead of the labour voucher.