Example 4 is structured properly, but so woefully inaccurate....

I got Example 4 correct and all, but as an archaeologist of the Near East (PhD and all - had my fun there and now on to law!), this passage is so painfully wrong. Who came up with it? Some of the earliest monetary systems were in ancient Syria/Iraq (shekels), even before the Greek Midas of Lydia made the coins we know now. Heck, even Hammurabi's Code lays out workers' pay in shekels over a millennium before. In the 4th Century, that whole area was under the control of the Persians (Achaemenids) and using their monetary system. They also definitely had marketplaces (mahirum) around this time, even if they didn't have much use for them in their early history. I know we're meant to abide by the universe of the question, but that passage was so horribly inaccurate. It was easy to extract the pure logic through my pain though. Also, sorry, but Meso-Po-TAY-Me-Uhn! Potomac is the DC River! :)