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Agreed. Even the first world countries there are still a lot of people who aren't tech savvy to understand the complexity of a cashless transactions.
How much more on the 3rd world countries. Both would co-exist and as time passes by cashless transactions might become the most preferred one than paying on cash, but cash won't just disappear, both would still co-exist.
We are already practicing the cashless payment in some points of our daily life.
Like paying an online merchant or other online purchases.
However, it is true, not all people are amenable to this kind of payment method even in first world countries.
I think, cash payment will remain, though digital payments may increase a lot in the coming years.
Let us embrace both methods, anyway, we have daily purchases that do really need physical cash, whether you are in 1st world or 3rd world country.
Indeed, some people are doing this for many years already but it is never enough to enlighten others to adapt to the system knowing that they don't have the capacity to do it. In any form of cashless payment, nothing has been largely compared to fiat money which means that the majority are still reliant to paper money for their convenience and are most likely don't have a reason to stop using it. The word convenience makes people to choose what they want and a particular method of payment.