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Money with a Hole in it

A comment by Evan-san:

I was reading your page on Japanese coins and you said you don't know what the holes in the coins are for, I think this is the answer. With a hole in the middle they could stack the coins on short metal rods so they could easily grab however many were needed when giving change. I heard that somewhere although a long time ago so it's a little hazy, but it seems to make sense.

-Evan


A comment by Uichee-san:

The Japanese adopted it from the Chinese (just as they adopted Kanji, Buddhism, etc.), who made coins with square holes in the middle starting from the Qin dynasty (maybe 2nd century B.C.). For more information on this, see the following related websites:

http://www.imes.boj.or.jp/cm/english_htmls/history_01.htm

http://www.imes.boj.or.jp/cm/english_htmls/history_02.htm

http://www.imes.boj.or.jp/cm/english_htmls/history_03.htm

But how did the Qin come up with the idea of making a square hole in the middle of the coin, then? Hmm...many people believe Evan-san's theory, but I think there are several possibilities:

1. Evan-san's theory
2. They may not have had very much bronze, so those who crafted this money may have made a big hole