Humans don't generally have the same needs, and to the extent they do they're competing over limited resources.
At one extreme you get theories like communism or socialism that treat humans as disposable cattle to be murdered or starved when they stand in the way of whatever the party leaders decide is the common good.
The common good is something that has to be worked out deliberatively and is more like taking the resultant of a huge number of force vectors than it is like mass producing units of the same good for everyone.
The word "Common Good" has a specific meaning. It steams from the word "Common" which means the people that share common values at our most basic levels, and "Good" means whats best for the people that share these common values.
What you are talking about is imposed self-interest at the level of the population from one or a small population that do not represent the common good. Not the same thing IMHO.
That's not what common good is. Common good never requires that people share core values.
Common good historically was what's good for the city/polis/country/band/family. Basically, you make some (ideally relatively small) sacrifice to your own interest for the sake of a larger group you share fate with.
There are more formal/mathematical versions of it, for example in Bentham where the common good is essentially a weighted sum over the good to each individual. Rousseau described it almost exactly as the resultant of force vectors. There are more authoritarian versions like in historical Sparta and more recently in Marx and Engels where it's imposed through violence.
> imposed self-interest
I'm not sure exactly what you're saying here, but self-interest is almost by definition not externally imposed. In Marxism one particular vision of the common good is imposed externally via a "revolutionary terror."
c. 1300, "belonging to all, owned or used jointly, general, of a public nature or character," from Old French comun "common, general, free, open, public" (9c., Modern French commun), from Latin communis "in common, public, shared by all or many; general, not specific; familiar, not pretentious." This is from a reconstructed PIE compound ko-moin-i- "held in common," compound adjective formed from ko- "together" + moi-n-, suffixed form of root mei- (1) "to change, go, move," hence literally "shared by all."
Your confusing political language with what came before this. Common good is the will of the people. It has nothing to do with cities, countries, or states. All of those things were created by people that wield political power. This is not the same as the common good. Common good directly relates to what is good for the people that share common values. You have been misinformed, by political society unfortunately.
The idea of common good is centuries older than the appearance of French or the English translation.
It has nothing to do with shared values. It's exactly as I described it above.
Notice the reconstructed PIE means to move together. Common good is about the interests of groups that co-move rather than groups that share values.
This makes sense even in family contexts. What is good for the family is often different from what any one person wants. Think about things like choosing dinner for a big hungry family on a long road trip.
Often the best solution is at best everyone's third or fourth choice because values and desires differ.
So "Common Good" is directly related to "Common Law" which showed up in 509-27 BC Rome during the Republic period and it was a way to have a common understanding between the "Common People" when Rome's political state was trying to use political law against non-Romans. The common people needed a way to protect themselves from the rising emperors and their decrees.
So I understand that you think its about families, but in this context, its really not. It was a way or a method to protect commoners.
When I say value, I mean if we both value freedom then we have a "Shared Value". This is really about the rights of the people which differs what rulers, want for the people. And I mean rulers that want to wield power against the people, for self-interested purposes.
Again that is not what common good is and it does not originate in the Roman Republic.
I'm honestly not sure it's worth responding here or what you're trying to say about Rome. It sounds like you may be confusing the Roman Republic with the Roman Empire, which started much later in 31 BCE. For one thing the Roman Republic did not have an emporer. For another it wasn't expanding militarily or ruling non-Romans.
And you also seem to be confusing different uses of "common".
Common generally means something held collectively by a group. By extension it can mean "customary" as in common law rather than statutory law. By extension it also can mean "ordinary" or "plain", as in "common house cat". "Commoners" or "common people" are just "ordinary" people; that is, people without titles.
The only connection between the "common" in "common good" and "common people" is the use of the string "common". The word means different things in the two contexts.
Rome most certainly was expanding militarily and ruling non romans far before it became an empire. The punic wars for example were more than a century before it became an empire.
No the original meaning of "Common Good" is related to "Common Law" And that actually originated in Rome between the Republic and Empire periods. Your focus on the specific dates have nothing to do with the actual originating use of the saying.
It can mean "ordinary" or "plain", but not in the context of "Common Good". I think you are trying to obfuscate the meaning by focusing on the peripherals of the context.
In this context, I disagree.
Its really clear what the good in "Common" means.
Its like principles of what the Constitution was written on. Life, Liberty and the pursuit of happiness.
Principles like these are qualities we all naturally exhibit and as such doesn't need any explanation or qualifications. I know in our modern world people have decided that everything is open to interpretation. But I believe this was indoctrinated into us, over a long period of time, not to consider the human value[0] aspect of our being that we are born with. This was done by watering down the direct meaning of words and slowly changing the perception that humanity doesn't have infinite value and has to rely on external power structures to give it meaning.
At one extreme you get theories like communism or socialism that treat humans as disposable cattle to be murdered or starved when they stand in the way of whatever the party leaders decide is the common good.
The common good is something that has to be worked out deliberatively and is more like taking the resultant of a huge number of force vectors than it is like mass producing units of the same good for everyone.