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Asset returns, news topics and media effects

Høghaug Larsen, Vegard; Thorsrud, Leif Anders
Working paper
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Åpne
Working_CAMP_5-2017.pdf (3.100Mb)
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http://hdl.handle.net/11250/2455955
Utgivelsesdato
2017-09-19
Metadata
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  • Centre for Applied Macro- and Petroleum economics (CAMP) [104]
Sammendrag
We decompose the textual data in a daily Norwegian business newspaper into news topics and investigate their predictive and causal role for asset prices. Our three main findings are: (1) a one unit innovation in the news topics predict roughly a 1 percentage point increase in close-to-open returns and significant continuation patterns peaking at 4 percentage points after 15 business days, with little sign of reversal; (2) simple zero-cost news-based investment strategies yield significant an- nualized risk-adjusted returns of up to 20 percent; and (3) during a media shortage, due to an exogenous strike, returns for firms particularly exposed to our news mea- sure experience a substantial fall. Our estimates suggest that between 20 to 40 percent of the news topics’ predictive power is due to the causal media effect. Together these findings lend strong support for a rational attention view where the media alleviate information frictions and disseminate fundamental information to a large population of investors.
Utgiver
BI Norwegian Business School, Centre for applied macro- and petroleum economics
Serie
CAMP;5

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