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The free banking alternative to the centralized provision of lender of last resort services

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 market for liquidity services or price their liquidity products off the private liquidity options market. Subsidies to or penalties on institutions anxious for liquidity insurance would be a thing of the past.
If central banks were to cease providing liquidity options, their sole role in the future would be as managers of the clearing and settlement system. The provision of paper money can be easily fulfilled by private banks. I guess central banks would also have to manage the price level.
The above is a free-banking view of the world. The lender-of-last resort role is transferred from central banks to private markets. It is distilled into just another financial product.

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