Noise Bubbles

Noise Bubbles
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噪音气泡

DOI:
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发表时间:
2013
期刊:
影响因子:
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通讯作者:
Luca Sala
Luca Sala
中科院分区:
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文献类型:
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作者:
Mario Forni;Luca Gambetti;Marco Lippi;Luca Sala

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我们在股票价格决定中引入了不完全信息。代理人收到一个关于结构性冲击的嘈杂信号,驱动未来的股息变化。均衡股票价格包括一个短暂的“噪音泡沫”,它可能是与经济基本面无关的繁荣和萧条时期的原因。我们提出了一个非标准的VAR过程来估计脉冲响应函数的噪声冲击和泡沫成分的股票价格。噪音解释了美国股票价格的很大一部分。网络泡沫可以用噪音来解释。2007年的股票价格繁荣不是泡沫,而随后的股票市场危机是由于负面噪音冲击。
We introduce imperfect information in stock prices determination. Agents receive a noisy signal about the structural shock driving future dividend variations. Equilibrium stock prices include a transitory "noise bubble" which can be responsible for boom and bust episodes unrelated to economic fundamentals. We propose a non-standard VAR procedure to estimate impulse response functions to noise shock and the bubble component of stock prices. Noise explains a large fraction of US stock prices. The dot-com bubble is explained by noise. The 2007 stock price boom is not a bubble, whereas the following stock market crisis is due to negative noise shocks.