The core of Ripple is somewhat analogous to a bank account. When you have dollars, or any other normal currency, someone owes them to you. If you say "I have $5,000 in the bank", what you mean is that your bank owes you $5,000. Now, imagine if instead of having a regular bank account, you had something more analogous to a Bitcoin transaction output, and the bank agreed to pay the money to any customer of theirs that could prove they owned that transaction output. Now, you can transact in dollars just like you do in Bitcoins. You can send that balance to someone, split it up, join it, whatever. And that output has value because any customer of that bank can redeem it for cash.
There's a lot more, but that's the basic answer to what sense it makes -- it lets people transact in national currencies much like they currently transact in Bitcoins. One key difference, however, is that someone has to hold the actual currency and you have to decide who you will trust to do that.
Thanks for your posts, Joel, you always speak wisdom.
However, when you say "The core of Ripple is somewhat analogous to a bank account. When you have dollars, or any other normal currency, someone owes them to you. If you say "I have $5,000 in the bank", what you mean is that your bank owes you $5,000. " There is a very important difference here. In the case of the bank, you know the bank is good for the money. When it's other people holding the money, there is far less certainty as to its payability.
So the issue here is that the money is not as fungible as otherwise. Paying someone $100 in cash is "money good" But paying someone with an IOU for $100 cash is less valuable. In other words, a $100 IOU is not worth $100. I worry that this fundamental issue is going to cause problems.
You say,
" it lets people transact in national currencies much like they currently transact in Bitcoins."
But it doesn't, really, enable this. It lets people transact in
IOU's for national currencies. When I send someone a Bitcoin, they actually get the Bitcoin. When I send someone $100 USD via Ripple, the recipient only gets an IOU. With Bitcoin, money is actually moving. With Ripple, money is not moving. The brilliance of Bitcoin is creating a way to actually move money without a central party. Ripple may not have a central party, but it is also not actually moving money.