DeFi and the Future of Finance. Campbell R. Harvey
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as today's financial system is plagued with inefficiencies, it is far better than those of the past, where market exchanges were peer to peer and bartering required two parties' needs to match exactly. Out of this, an informal credit system emerged in villages whereby people kept a mental record of “gifts.”1
Modern coinage came much later, first emerging in Lydia around 600 BCE and providing what we think of as today's functions of money: unit of account, medium of exchange, and store of value. Important characteristics of money included durability, portability, divisibility, uniformity, limited supply, acceptability, and stability. Bank notes, originating in China, made their way to Europe in the thirteenth century.
Nonphysical transfer of money originated in 1871 with Western Union. Figure 2.1 shows a copy of an early transfer for $300. Notice how the fees amount to $9.34, or roughly 3 percent. It is remarkable that so little has changed in 150 years: money transfers are routinely more expensive, and credit card fees are 3 percent.
Figure 2.1 Western Union transfer from 1873
Source: Western Union Holdings, Inc.
The last 75 years has seen many firsts in the financial world: credit card in 1950 (Diners Club); automated teller machine (ATM) in 1967 (Barclays Bank); telephone banking in 1983 (Bank of Scotland); Internet banking in 1994 (Stanford Federal Credit Union); radio-frequency identification (RFID) payments in 1997 (Mobil Speedpass); chip-and-pin credit cards in 2005 (Mastercard); and Apple Pay with a mobile device in 2014 (Apple).
Importantly, all these innovations were built on the backbone of centralized finance. While there have been some technological advances, the structure of today’s banking system has not changed much in the past 150 years. That is, digitization still supported a legacy structure. The high costs associated with this legacy system has spurred further advances known as fintech.
FINTECH
When costs are high, innovation will arise to capitalize on inefficiencies. Sometimes, however, a powerful layer of middle people can slow this process. An early example of decentralized finance emerged in the foreign currency (forex) market 20 years ago. At the time, large corporations used their investment banks to manage their forex needs. For example, a U.S.-based corporation might need €50 million at the end of September to make a payment on some goods purchased in Germany. Its bank would quote a rate for the transaction. At the same time, another client of the bank might need to sell €50 million at the end of September. The bank would quote a different rate. The difference in the rate is known as the spread – the profit the bank makes for being the intermediary. Given the multitrillion-dollar forex market, this was an important part of bank profits.
In early 2001, a fintech startup offered the following idea.2 Instead of individual corporations querying various banks to get the best rate, why not have an electronic system match the buyers and sellers directly at an agreed upon price and no spread? Indeed, the bank could offer this service to its own customers and collect a modest fee (compared with the spread). Furthermore, given that some customers deal with multiple banks, it would be possible to connect customers at all banks participating in the peer-to-peer network.
You can imagine the reception. The bank might say: “Are you telling me we should invest in an electronic system that will cannibalize our business and largely eliminate a very important profit center?” However, even 20 years ago, banks realized that their largest customers were very unhappy with the current system. As globalization surged, these customers faced unnecessary forex transactions costs.
An even earlier example was the rise of dark pool stock trading. In 1979, the U.S. Securities and Exchange Commission (SEC) instituted Rule 19c3, which allowed stocks listed on one exchange, such as the New York Stock Exchange (NYSE), to be traded off-exchange. Many large institutions moved their trading large blocks to these dark pools, where they traded peer to peer with far lower costs than traditional exchange-based trading.
The excessive costs of transacting has ushered in many fintech innovations. PayPal,3 founded more than 20 years ago, is a forerunner in the payments space; in 2017, seven of the largest U.S. banks added their own payment system called Zelle.4 An important commonality of these cost-reducing fintech advances is that they rely on the centralized backbone of the current financial infrastructure.
BITCOIN AND CRYPTOCURRENCY
The dozens of digital currency initiatives beginning in the early 1980s all failed.5 The landscape shifted, however, with the publication of the famous Satoshi Nakamoto Bitcoin white paper6 in 2008, which presents a peer-to-peer system that is decentralized and uses the concept of blockchain. Invented in 1991 by Haber and Stornetta,7 blockchain was initially primarily envisioned to be a time-stamping system to keep track of different versions of a document. The key innovation of Bitcoin was to combine the idea of blockchain (time stamping) with a consensus mechanism called proof of work (introduced by Back8 in 2002). The technology produced an immutable ledger that eliminated a key problem with any digital asset: you can make perfect copies and spend them multiple times. Blockchains allow for the important features desirable in a store of value, which were never before simultaneously present in a single asset. Blockchains allow for cryptographic scarcity (Bitcoin has a fixed supply cap of 21 million), censorship resistance and user sovereignty (no entity other than the user can determine how to use funds), and portability (can send any quantity anywhere for a low flat fee). These features combined in a single technology make cryptocurrency a powerful innovation.
The value proposition of Bitcoin is important and can be best understood juxtaposed with that of other financial assets. For example, consider the U.S. dollar (USD). It used to be backed by gold before the gold standard was abandoned in 1971. Now, the demand for USD comes from (a) taxes, (b) purchase of U.S. goods denominated in USD, and (c) repayment of debt denominated by USD. These three cases create value that is not intrinsic but rather is based on the network that is the U.S. economy. Expansion or contraction in these components can impact the price of the USD. Additionally, shocks to the supply of USD adjust its price at a given level of demand. The Fed can adjust the supply of USD through monetary policy in an attempt to achieve financial or political goals. Inflation eats away at the value of USD, decreasing its ability to store value over time. One might be concerned with runaway inflation – what Paul Tudor Jones calls the great monetary inflation – which would lead to a flight to inflation-resistant assets.9 Gold has proven to be a successful inflation hedge due to its practically limited supply, concrete utility, and general global trustworthiness. However, given that gold is a volatile asset, its historical hedging ability is realized only at extremely long horizons.10
Many argue that Bitcoin has no “tangible” value and therefore should be worthless. Continuing the gold comparison, approximately two-thirds of gold is used for jewelry, and an additional amount is used in technology hardware. Gold has tangible value. The U.S. dollar, while