On the FT’s Alphaville blog, Izabella Kaminska questions the value of decentralization (and thus, blockchain technology) in intermediation.
Decentralisation is, in almost all cases, not an efficiency. To the contrary, it’s a cost that adds complexity and creates an unnecessary burden for both users and operators unless centralised layers are added on top of it — defying the whole point. …
At the end of the day, there are only two groups of people prepared to go to costly lengths to decentralise a service which is already available (in what is often a much higher quality form) in a centralised or conventional hierarchal state. One group is criminals and fraudsters. The other is ideologues and cultists. …
It’s not privacy, because a centralised system can be encrypted just as much as a blockchain-based one.
CEPR Discussion Paper 11482, August 2016, with Martin Gonzalez-Eiras. PDF. Also published as CESifo Working Paper 6062, Study Center Gerzensee Working Paper 16-05. PDF, PDF.
We propose a theory of tax centralization and inter governmental grants in politico-economic equilibrium. The cost of taxation differs across levels of government because voters internalize general equilibrium effects at the central but not at the local level. This renders the degree of tax centralization and the tax burden determinate even if none of the traditional, expenditure-related motives for centralization considered in the fiscal federalism literature is present. If central and local spending are complements and the trade-off between the cost of taxation and the benefit of spending is perceived differently across levels of government, inter governmental grants become relevant. Calibrated to U.S. data, our model helps to explain the introduction of federal grants at the time of the New Deal, and their increase up to the turn of the twenty-first century. Grants are predicted to increase to approximately 5.5% of GDP by 2060.
The Economist reviews the blockchain technology underlying Bitcoin—“a way of making and preserving truths.”
It is the blockchain that replaces this trusted third party. A database that contains the payment history of every bitcoin in circulation, the blockchain provides proof of who owns what at any given juncture. This distributed ledger is replicated on thousands of computers—bitcoin’s “nodes”—around the world and is publicly available. But for all its openness it is also trustworthy and secure. This is guaranteed by the mixture of mathematical subtlety and computational brute force built into its “consensus mechanism”—the process by which the nodes agree on how to update the blockchain in the light of bitcoin transfers from one person to another.
One interesting aspect of the blockchain technology is that it provides incentives for “mining”, rendering it self-sustainable. The future may lie in blockchain applications beyond payments, for example in securities clearance, certification and the like.