| 来源类型 | Discussion paper
|
| 规范类型 | 论文
|
| 来源ID | DP10147
|
| DP10147 Understanding Uncertainty Shocks and the Role of Black Swans |
| Laura Veldkamp
|
| 发表日期 | 2014-09-21
|
| 出版年 | 2014
|
| 语种 | 英语
|
| 摘要 | A fruitful emerging literature reveals that shocks to uncertainty can explain asset returns, business cycles and financial crises. The literature equates uncertainty shocks with changes in the variance of an innovation whose distribution is common knowledge. But how do such shocks arise? This paper argues that people do not know the true distribution of macroeconomic outcomes. Like Bayesian econometricians, they estimate a distribution. Using real-time GDP data, we measure uncertainty as the conditional standard deviation of GDP growth, which captures uncertainty about the distribution?s estimated parameters. When the forecasting model admits only normally-distributed outcomes, we find small, acyclical changes in uncertainty. But when agents can also estimate parameters that regulate skewness, uncertainty fluctuations become large and counter-cyclical. The reason is that small changes in estimated skewness whip around probabilities of unobserved tail events (black swans). The resulting forecasts resemble those of professional forecasters. Our uncertainty estimates reveal that revisions in parameter estimates, especially those that affect the risk of a black swan, explain most of the shocks to uncertainty. |
| 主题 | Financial Economics
; International Macroeconomics
|
| 关键词 | Forecasting
Rare events
Uncertainty
|
| URL | https://cepr.org/publications/dp10147
|
| 来源智库 | Centre for Economic Policy Research (United Kingdom)
|
| 资源类型 | 智库出版物
|
| 条目标识符 | http://119.78.100.153/handle/2XGU8XDN/538980
|
推荐引用方式
GB/T 7714 |
Laura Veldkamp. DP10147 Understanding Uncertainty Shocks and the Role of Black Swans. 2014.
|
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