Right but the gov can't ban it from existence. Just transactions on the books or that are caught by them.
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Because all problems are solved by printing no moneyAparrently easier with large bills:
Japan to print additional ¥10,000 bills as more people stash their cash at home
http://www.japantimes.co.jp/news/2016/04/07/business/japan-¥10000-note-output-1-23-billion-pare-smaller-bills-public-seen-stashing-cash-home/#.VwZnkfkrL0P
Because all problems are solved by printing no moneyAparrently easier with large bills:
Japan to print additional ¥10,000 bills as more people stash their cash at home
http://www.japantimes.co.jp/news/2016/04/07/business/japan-¥10000-note-output-1-23-billion-pare-smaller-bills-public-seen-stashing-cash-home/#.VwZnkfkrL0P
interesting