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Inspired by Perry Mehrling and Fischer Black: I think I'd take your future ideal financial model even further (slide 9). The C5 in your model provides what you call liquidity puts. I see no reason why these liquidity puts need be provided by a central bank. In the future, financial products called liquidity options - the option to buy or sell some asset (say Apple stock) at a guaranteed point in the bid-ask spread - would be popular financial products traded on organized exchanges. Just as Apple CDS allow investors to split off Apple credit risk and distribute it across the economy, so would Apple liquidity options split away the liquidity risk of transacting in Apple stock in the secondary market and evenly distribute this risk to those willing and capable of holding it. A private liquidity options market has some advantages over a monopoly last resort system. Liquidity would be competitively priced and no longer supplied in an opaque manner. Central banks would either vacate the...

In an older post , Scott Sumner had an interesting comment: The most recent inflation rate in Greece is 1.7%, whereas Spain has 1.9% inflation. I don’t know about you, but I find those figures to be astounding. That’s not deflation, and yet Tyler’s clearly right that they are being buffeted by powerful deflationary forces. I’d make several observations: 1. This shows the poverty of our language. Economics lacks a term for falling NGDP, even though falling NGDP is arguably the single most important concept in all of macro, indeed the cause of the Great Depression. So we call it “deflation” which is actually an entirely different concept. I wouldn’t be the first to find connections between the poverty of our language and the poverty of our thinking. He's right that deflation is sort of catch-all phrase, and this imprecision in our language doesn't help out our thinking. By catch-all, deflation can simultaneously mean falling prices, falling NGDP, or most commonly, a  fall ...

Perry Merhling had an interesting quote from Fischer Black: Thus a long term corporate bond could actually be sold to three separate persons. One would supply the money for the bond; one would bear the interest rate risk; and one would bear the risk of default. The last two would not have to put up any capital for the bonds, although they might have to post some sort of collateral In the comments I pointed out that a fourth person can be added to the list - someone who bears the liquidity risk of that corporate bond in the secondary market. This would amount to a liquidity option. Essentially, the bearer of liquidity risk would allow the bond owner to sell that bond at some preset level in the bid-ask spread. For instance, the option could allow the bond owner to immediately sell their entire bond holdings at the upper end of the spread, or at the ask price. Normally, sellers can only sell quickly if they accept a price near the bid price, or lower end of the bid-ask spread. When il...