Baghdad is a ring-shaped city, divided into an inner city and an outer city. The outer city is the slums, while the inner city is the affluent area, with much better surroundings. At the same time, the threshold is higher, requiring review before one can enter. The impoverished are shooed away by guards.
Alberts brought a large amount of local currency, including the Fudo Kingdom and the entire Mediterranean Region's unified currency: the Dinar Gold Coin and the Dirham Silver Coin.
One Dinar Gold Coin could be exchanged for 10 Windsor Silver Shillings, 22 Dirham Silver Coins, which is equivalent to 0.5 Gold Pounds.
There is no such thing as 0.5 Gold Pounds, and constant conversion is too bothersome, so Marvin thought it simpler to remember that 1 Gold Pound could be exchanged for 2 Dinar Gold Coins.