[rdssassin]

If there's a need for cash, it will exist in some form.

If the governments of the world get rid of cash, meaning all of our transactions are identifiable and traceable by gov'ts and corporations an immediate black-market cash system of some kind will spring up. Of course, they'll make it illegal, and if caught then you'll go to jail just for buying something legal but embarrassing. Then various methods will be invented to help ensure people aren't caught as easily.

Such is the way of things.

[NameNickHN]

There is still trade by barter. ;-) If push comes to shove, people will find a way.

[eru]

I wonder what the new cigarettes or nylon stockings will be.

[lignuist]

In some countries smaller trades are done with prepaid credits for cellphones.

[GFischer]

Tide detergent seems to be the money equivalent of choice among drug dealers:

http://bastiat.mises.org/2012/03/tide-as-money/