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15

Depending on what the threats are the numbers will change so try updating your question with some more information about it. But to give a bit of a ball park that would be realistic if you ask me. No real threats, just a police force ~1% Some military for exploration in possible hostile territory 1.5% Confirmed hostiles in the area but no real war 2.5% ...


7

Depends on the technology ... A sufficiently advanced technology could send warp ships into orbit, beam the people directly into stasis pods, and then fly them to the destination. The problem with that is that a technology which has transporters like Star Trek, and computers to control all this, might not need millions of workers. An insufficiently ...


6

No money. Barter. https://en.wikipedia.org/wiki/One_red_paperclip One red paperclip is a website created by Canadian blogger Kyle MacDonald, who bartered his way from a single red paperclip to a house in a series of fourteen online trades over the course of a year. ... Better. His site received a considerable amount of notice for tracking the ...


5

Your mayor needs to acquire insight into exactly the details which you claim don't matter: the reasons why the city is to be destroyed and who will benefit. This may involve a multi-step intellectual scavenger hunt, beginning with his liaison contacts in the higher/federal government but once that proves unfruitful, Anonymous-style hacker-groups, criminal ...


5

What you're looking for is known as the "Basket of goods" and is designed to represent the things ordinary people buy on a day to day basis. A basket of goods refers to a fixed set of consumer products and services valued on an annual basis. The basket is used to track inflation in a specific market or country. The goods in the basket are often adjusted ...


5

As is so often the case, you should ask yourself what problem you want to solve. Having an army is an expensive and also a dangerous hobby. It means having a large group of well-educated and armed people, that sit around doing nothing while still needing to be fed, clothed and equipped. You have a post-apocalyptic setup, and all of the population of a medium-...


4

I hate to write this kind of answer, but you're taking this the wrong way round. Forget population for a moment: exactly where does DC rule? You suggest neighboring counties. OK, let's start with Fairfax and Arlington in Virginia, and Prince George's, Anne Arundel, Calvert, Montgomery, Howard and Charles in Maryland. This gives a fairly compact area bounded ...


4

This sounds to me like the equivalent of having radios that are too expensive to be mass-produced, but not so expensive as to be prohibitive for governments/militaries/wealthy tradesmen. The biggest impact I'm immediately seeing is for warfare. Throughout the history of warfare strategy, communication has always been a pain-point. The general may be on a ...


4

Purchase your slaves from other members of their species. https://en.wikipedia.org/wiki/Atlantic_slave_trade Current estimates are that about 12 million to 12.8 million Africans were shipped across the Atlantic over a span of 400 years, although the number purchased by the traders was considerably higher, as the passage had a high death rate... ...


4

Weapons You can't kidnap 50 million humans without someone noticing. It's simply not possible. In addition, the amount of logistics and energy you would require in order to transport 50 million humans off-world is such that your fleet would be noticed by the current space gazing infrastructure. Sure, you can bend rules to give your fleet ultra-stealth ...


3

It depends a lot on the existing culture and who discovered the stones first. If the culture that first discovered them were nomadic tribesmen with a warrior culture, they could coordinate raids on a massive scale across vast distances to great advantage. It would enable a particularly charismatic chieftain to have a much wider influence than he normally ...


3

I know you asked for a more economic solution, but I'll opt to give a more political one, as economy has always been secondary (and directly related to) how well the government functions. Govenments would form more quickly. Imagine having the communications technology to call the police or the fire brigade instantly as a caveman. Humans would adapt this ...


3

Assume that travel and trade is possible. Then the usual reason to trade is comparative advantage. Planet A has pretty exhausted mines for iron ore (because they've been producing steel tablespoons for a long time) and excellent factories for tablespoons (same reason). Say that it takes 10 man-days to mine the ore for a shipment of tablespoons, and 10 man-...


3

As other answers have stated, you need a reason (preferably more than one) why the dragon is tolerated, or your situation will not survive. Given that dragons in that time period are generally seen as raiding farms (disastrous to the peasants), hoarding treasure (sure to draw enterprising thieves), or even stealing away virgin princesses (sure to infuriate ...


2

You don't need a modern military unless you're going to fight against one Fighter and bomber jets are very expensive for a post-apocalyptic scenario when there's no real enemy that they can shoot at -- no other air forces or large-scale targets. It sounds like in your scenario the regime's enemies are "militia", meaning ordinary people and small groups ...


2

75,000 troopers is plausible, but unlikely As with all things, someone on the internet has done some research on this already. John Savage talks about this in the context of a fantasy/medieval nation, but his work should give us a good first guess. You have a population of 450,000 citizens. Our first pass is to remove people who are not eligible due to ...


2

Cost verses Return When it becomes too expensive that the peasants can't afford to. If it's good bountiful land, they can afford more. If the dragon keeps out other dragons from the area that might eat them, it's worth more. If the cost of a lord and his army is more than the dragon. When the cost is too high, the peasants will either try and drive off or ...


2

There just has to be a reason the people are tolerating an acid-breathing dragon roaming around. (and not threatening to burn the town, that would draw in the army!) Tribute According to research published by the Eastern Kentucky University, the average medieval peasant ate 3500-4000 calories a day, so the dragon would need about the same amount of ...


2

Depends on the size of the nation, if little like Vatican City it could do it very fast, if big like USA or Russia never. Actually the biggest problem is not the production of electricity but the transport of electricity. Even if your super reactor produces infinite energy at no cost, you can't transport for free. Most energy will be wasted over great ...


2

The current world population went, in the blink of an eye from 7 billion to 3.5 billion. This would be the largest decimation of human population in history and would immedietly make the species endangerd by technical rules. The world population hasn't been this low for a long time. In fact, you'd have to go all the way back to that amazing far flung ...


2

"Post-scarcity" really throwing a wrench into the available approaches. Normally, you would follow @Separatrix advice and compile some futuristic "basket of goods". But if this is a truly post-scarcity society, this list would be meaningless, as most of the items on it would become negligibly cheap. What you need to do is to try to think through you ...


2

A few off the top of my head: Asteroid impact or megavolcano. Make it as big or as small as you want. Put it anywhere you want. Directly destroys whatever it lands on. Throws up huge dust clouds that affect crop production and biosphere for years (look up the proposed dinosaur-killing asteroid and scale it back by a factor of 2). If you land it in the ocean ...


1

Aliens silently made planet inhospitable - they tricked lesser race to believe their planet has global warming, while, in reality, its has ice age starting. After long winters and floods destroyed crops, lesser race will willingly follow anybody, who promise to save them from hunger, even if they had to board big and overcrowded warp ships, that will ...


1

Two ideas: (1) Fossil Fuels Suddenly Run Out: We know the fossil fuels will eventually run out. They just ran out much sooner than predicted. This cripples most industry but has no obvious effect on the biosphere. Eventually we can recover by converting to nuclear/solar/wind. (1.5) Earthquakes make some major oil wells inaccessible. Yes the fuel is ...


1

Somewhere in the range 40 years to "never" Power is one of those things that individuals, corporations and governments get very twitchy about. Murphy's Law is a basic engineering principle - anything that can go wrong will go wrong eventually. Even if the magic reactor cannot possibly fail, the lines transmitting the power to everywhere else can be ...


1

I think that a lot depends on the state of the current members of your space-UN. If those members are post-scarcity-societies, the new planet will quickly gain access to the UN. Yet, trade will come first. As soon contact is possible it will be made. And provided that it is possible for private companies to make contact and have the physical possibilities ...


1

Build your 75,000 strong military. Then use it. A whole bunch of hungry men sitting around waiting to fight is a drain on resources. Unless they fight. If you have the resources to feed and equip such a force, your army should be used for wars of conquest. You will build the United States back into the country it was bit by bit. The Virginia ...


1

Throughout much of the Middle Ages, Feudalism was one of the most popular economic and social systems within Europe. In the average fief, as few as 15-30 peasant families could provide for a single knightly household. Including the knight's immediate and extended family, slaves, and stewards, a knight's household could easily include 12 people, with the ...


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