NATIONAL BUREAU OF ECONOMIC RESEARCH
NATIONAL BUREAU OF ECONOMIC RESEARCH
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Yang You

Harvard University
Littauer Center
1805 Cambridge Street
Cambridge, MA 02138

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Institutional Affiliation: Harvard University

NBER Working Papers and Publications

November 2019Redeemable Platform Currencies
with Kenneth S. Rogoff: w26464
Can massive online retailers such as Amazon and Alibaba issue digital tokens that potentially compete with bank debit accounts? We explore whether a large platform’s ability to guarantee value and liquidity by issuing prototype digital tokens for in-platform purchases constitutes a significant advantage that could potentially be leveraged into wider use. Our central finding is that unless introducing tradability creates a significant convenience yield, platforms can potentially earn higher revenues by making tokens non-tradable. The analysis suggests that if platforms have any comparative advantage in issuing tradable tokens, it comes from other factors.
February 2017Bubbles for Fama
with Robin Greenwood, Andrei Shleifer: w23191
We evaluate Eugene Fama’s claim that stock prices do not exhibit price bubbles. Based on US industry returns 1926-2014 and international sector returns 1985-2014, we present four findings: (1) Fama is correct in that a sharp price increase of an industry portfolio does not, on average, predict unusually low returns going forward; (2) such sharp price increases predict a substantially heightened probability of a crash; (3) attributes of the price run-up, including volatility, turnover, issuance, and the price path of the run-up can all help forecast an eventual crash and future returns; and (4) some of these characteristics can help investors earn superior returns by timing the bubble. Results hold similarly in US and international samples.

Published: Robin Greenwood & Andrei Shleifer & Yang You, 2018. "Bubbles for Fama," Journal of Financial Economics, . citation courtesy of

 
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