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█ ▌Currency and Trade

Currency takes the form of metal coins called Bits and Marks. They are round and relatively flat. A king's face from past generations is imprinted on them- not the current ruler. Nobody really remembers who that was. They follow a conversion system:

4 Bits -> 1 Copper Mark
40 Bits -> 10 Copper Marks -> 1 Silver Mark
400 Bits -> 100 Copper Marks -> 10 Silver Marks -> 1 Gold Mark

A normal villager is unlikely to ever carry around silver. The highest level of currency they usually deal in is copper. Middle-class likely carries silver for bigger trades the way we carry 50-dollar bills IRL.

Self-sufficient rural towns that do not lie on trade routes often function mainly on barter between villagers, so coin is a less common sight there. Barter is less common but not unheard of, and not usually unwelcome in cities.

The creation of new currencies, coin or otherwise, is outlawed- however, barter is not. While currency is identical and used across all lands with the same conversion system, resources and bartered goods may change in relative value depending on where and when they are being bought or sold. Here are some examples of prices for common goods:

1 SMALL loaf of bread (1 meal): 1 bit
1 BIG loaf of bread (4 meals): 2 bits
50 pound bag of milled wheat flour: 2 copper (ex.: low crop yield season would be 4 copper)
You might be able to produce a dozen BIG loaves of bread with this amount of milled wheat flour.
1 bushel of wheat: 2 bits (ex.: a mountainous location with no large fields this might be 3 bits or even 1 copper normally)
1 bushel of wheat can produce slightly less than 50 pounds of flour when milled.

An average village often only has one or two mills. In exchange for using someone's mill, a farmer must often pay the mill owner with a portion of the flour they've milled, between 10-30%. Too steep a price, and people will travel to the next village and use their mill instead.

█ ▌Names

Names and racial descents of any origin are accepted. If people make a character of any racial descent, then in Beyond Walls canon, that race hasn't died out (unlike AoT where asians are almost entirely vanished).

If a child is an orphan of unknown origins, or for whatever reason does not know their name, their last name becomes the name of the wall territory they were born or found in. Yes, you could be that unfortunate Lieutenant John Maria. The wall as a last name is strictly for if they don't know whose family the child belongs to, and they keep it the rest of their lives unless they marry in to another family name.

█ ▌Education

Schooling for children is compulsory up until middle school (~age 11), at which point children may opt to drop out and aid their parents in work if needed. The inner district children are often more highly educated with private tutors or a boarding academy.

█ ▌Segregation by the Walls

When it comes to leaving the walls, no one is allowed to, save for the survey troops. Once in a while you might catch a gaggle of youth daring one another to sneak outside the walls.

Immigration isn't a very big deal between districts not separated by a wall, though it is discouraged. Immigrating between districts separated by walls can be the cause of population problems, however, and so is a more difficult process involving paperwork and, if not granted special permission, exchanges of money. Immigrating from outside of Wall Sina to inside of it can only occur on special conditions; invitation to the interior by a noble willing to accommodate useful members of the middle class on areas in their jurisdiction, or being assigned a post there by the Military Police are both examples.

The capital, Mitras, is located as a district in the interior, the innermost section of the three walls. The result of nobles mostly living within wall Sina is a difference of cultures inside and outside of wall Sina. People live more worry-free, peaceful and luxurious lives there and have time to develop hobbies and educations beyond that of the working citizen.