Electric money or electronic cash or credit card
My opinion is that the abolishment of hard currency or cash increases the risk of speculation and banking failure / defaults, because it INCREASES the speculation equity of the banks through fractional reserve banking. For each € put into the bank account, the bank is able to lend 10€ or more to customers from the ECB or FED. It increases speculative money supply and financial market volatility.
At the same time electric money decreases tax evasion for smaller companies and causes less friction by automated tax reports.
Since it is more difficult to withdraw large amount of money without being noticed, it battles crime and drug purchases.
In the last 6 years we have seen a raise in electric money and total digital payment in smaller countries like Estland and now even Bosnia,
while big countries like Germany still refuses to swap totally partly due to the high migration costs and investment in cash infrastructure.