To understand this, we have to compare two classes of systems: real-time gross settlement (RTGS) [1] and net settlement [2].
Suppose you and I are banks. At 9AM I send you ten dollars, at 10AM you send me ten dollars, at 3PM you send me another ten dollars and finally, at 4PM, I send you ten dollars. At the end of the day, we're back where we started (minus transaction costs). If we actually moved the cash between our banks, that would be RTGS. It's as fast as funds can travel. It results in a lot of paperwork and means we must have the cash for potential transfers immediately available. No exceptions.
We grab a beer and say "let's settle, on the net, at the end of the day." The same transfer instructions come in. This time, though, no cash moves intraday. At the end of the day, we tally everything up and find we're balanced. We move money around internally an call it a day. Much easier, and therefore, cheaper. Moreover, between when I deducted the funds at 9AM and may have had to settle at 4PM, I might have made a margin loan. This is net settlement.
The next day, at net settlement, I owe you ten more dollars than I have. We grab a beer and say "let's settle the day after. That way, we can sell or borrow if we come up short." This is net settlement with delayed settlement.
From top to bottom, the system gets slower and more profitable. Many of these costs, e.g. intraday liquidity and risk management, don't go away with cryptocurrencies. Net settlement will always be cheaper than real-time settlement, and delayed settlement cheaper still.
Payers prefer ACH because it gives them time to scramble, if needed. Receivers prefer to receive by wire because it produces immediately-available funds. What gets chosen depends on negotiating leverage. I struggle to see the advantage of a crypto-currency based RTGS, which is less reversible than EFTs, slower than wires, and more expensive than both for most participants.
To understand this, we have to compare two classes of systems: real-time gross settlement (RTGS) [1] and net settlement [2].
Suppose you and I are banks. At 9AM I send you ten dollars, at 10AM you send me ten dollars, at 3PM you send me another ten dollars and finally, at 4PM, I send you ten dollars. At the end of the day, we're back where we started (minus transaction costs). If we actually moved the cash between our banks, that would be RTGS. It's as fast as funds can travel. It results in a lot of paperwork and means we must have the cash for potential transfers immediately available. No exceptions.
We grab a beer and say "let's settle, on the net, at the end of the day." The same transfer instructions come in. This time, though, no cash moves intraday. At the end of the day, we tally everything up and find we're balanced. We move money around internally an call it a day. Much easier, and therefore, cheaper. Moreover, between when I deducted the funds at 9AM and may have had to settle at 4PM, I might have made a margin loan. This is net settlement.
The next day, at net settlement, I owe you ten more dollars than I have. We grab a beer and say "let's settle the day after. That way, we can sell or borrow if we come up short." This is net settlement with delayed settlement.
From top to bottom, the system gets slower and more profitable. Many of these costs, e.g. intraday liquidity and risk management, don't go away with cryptocurrencies. Net settlement will always be cheaper than real-time settlement, and delayed settlement cheaper still.
Payers prefer ACH because it gives them time to scramble, if needed. Receivers prefer to receive by wire because it produces immediately-available funds. What gets chosen depends on negotiating leverage. I struggle to see the advantage of a crypto-currency based RTGS, which is less reversible than EFTs, slower than wires, and more expensive than both for most participants.
[1] https://en.wikipedia.org/wiki/Real-time_gross_settlement
[2] https://en.wikipedia.org/wiki/Net_settlement