The correct answer is: "Purchasing Power Parity"
The theory of the Purchasing Power Parity is used to compare the cost of life and living standards between two countries that use two different currencies. This is done by comparing two curriencies through a basket of goods, by comparing their market prices and, therefore, how they are valued under each currency. This enables to conclude how much of each currency you need to purchase an specific product (a bike) and hence, the purchasing power of consumers who hold that currency.
The Arab Maghreb Union or AMU consists of Algeria, Libya, Mauritania, Morocco, and Tunisia.
When the countries of Tunisia and Morocco became independent countries, it was also during that moment that the concept of an economic union was first thought of. The chief of state of the 5 members of these countries manages the AMU.
During World War I, 116,516 US soldiers were killed and 204,002 were wounded. If you add those two numbers together, the total number of US soldiers killed or wounded was 320,518.
You can represent that as a fraction of the current population of Chicago like this:

For simplicity's sake (since I assume the Chicago population number is an estimate), let's round the number of soldiers killed or wounded down to 300,000. That would look like this:

We can simplify that down a lot by dividing the number of soldiers and the number of Chicagoans by the least common denominator of 300,000. That would give us this fraction:

So for every 1 US soldier killed or wounded in World War I, there are 10 Chicagoans living in the city today.