Hi Davo. I was trying to highlight the difference of...

Hi Davo.
I was trying to highlight the difference of applicability and ease of use. This has no relevance to liquidity.
Cash, as in notes and coins, are a readily available and recognised as a means of transaction in almost every instant. If you physically hold cash then you can use it and this is the big difference between electronic money and cash.

I can operate electronically of course and transact using credit or debit with no issues and this has a wide applicability through most of the world. However the obvious vulnerability of the electronic system is that the system needs to operating and there needs to be a connectivity between computer, and internet and point of sale. If anyone of these breaks down then you are in some difficulty.

Last week if you were using a card you couldn't catch a cab; if you had cash there was no problem.

By the way I don't know where you get your info but to my understanding cash is very definitely money.