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People LOVE to deal in cash, I know I do.
No matter what the oddballs in WADC say, I think cash is pretty much here to stay and they can work on changing it if they like, but I don't think it's gonna fly - ever. Ditto for gold and silver and all precious metals. It'll be around forever.
You have to read to about the middle of the article to find the reasons why cash is the preferred method of payment and why I think it's really not going anywhere, just because a bunch of nimrod politicians think they want it to go away so they can SNOOP on you and your purchases. They can go to hell in a handbasket.