If you had a family would there need to be a mandate for you to help them?
Mandate? No, there are plenty of people who disconnect from their families and leave them behind upon becoming adults.
Personally, I'm very connected to my extended family many of whom live in distant countries. But those people are
familia, and are not a random assemblage of strangers. I also have a small group of close friends who are "like family," they too are not strangers.
Every person on this planet is not (in any way) a part of my extended family.
Thus we have a duty to do things that will not only benefit ourselves but will benefit others.
No, not a duty, but instead there is a option, one you can choice or not as you see fit.
But replace those strangers with friends and/or family and the picture becomes clearer
The problem with this example is that those random strangers in fact are not family or friends. A stranger and a family member are not interchangeable components in some social order.
Now to bring this back to the topic of money. Imagine being part of a family and all are living in a single house. Everyone has different responsibilities. These responsibilities are done not for money but because they contribute to the welfare of the family.
But when I go to work, to my place of employment, that is not the house of my family, it's a place of business. The owner or manager is not the head of my family, they are a instead the person for whom I am working, there is nothing wrong in the least in my expectation of financial compensation in exchange for my labors on their behalf.
You know, money.
Similarly, if I enter a store and obtain shoes, a restaurant where I am served a meal, a cantina where a refreshment in placed before me, I feel it's perfect reasonable to pay (money) for these things. Waitress get tipped for their efforts.
If I go and wash everyone's car (for example), I don't need to get paid because my contribution allows me to have access to what I need.
And if you (hypothetically) contributed absolutely nothing, would it be reasonable to "cut you off?" Or you do a inadequate job washing cars, who decides? Because whoever makes that determinate is your boss.
All contributions being an overall increase to the tribes success. Because individuals make up the tribe, they are the beneficiaries of those contributions.
Can you claim that the bartender with months of training contributes equal to the surgeon with a decade of education and the two decades of experience? Our current society compensates them differently.
Capitalism and corporatism is likewise avoided because everyone benefits from the individuals contribution.
If it was just farming and cottage industry perhaps, with a highly technological interstellar society this would be impossible.
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