41 citations · 57 across the 6 of their papers we have counts for
7 papers
Novel and topical business news and their impact on stock market activities
Takayuki Mizuno, Takaaki Ohnishi, Tsutomu Watanabe
We propose an indicator to measure the degree to which a particular news article is novel, as well as an indicator to measure the degree to which a particular news item attracts at…
The gradual evolution of buyer--seller networks and their role in aggregate fluctuations
Ryohei Hisano, Tsutomu Watanabe, Takayuki Mizuno +2
Buyer--seller relationships among firms can be regarded as a longitudinal network in which the connectivity pattern evolves as each firm receives productivity shocks. Based on a da…
Structure of global buyer-supplier networks and its implications for conflict minerals regulations
Takayuki Mizuno, Takaaki Ohnishi, Tsutomu Watanabe
We investigate the structure of global inter-firm linkages using a dataset that contains information on business partners for about 400,000 firms worldwide, including all the firms…
High quality topic extraction from business news explains abnormal financial market volatility
Ryohei Hisano, Didier Sornette, Takayuki Mizuno +2
Understanding the mutual relationships between information flows and social activity in society today is one of the cornerstones of the social sciences. In financial economics, the…
Bubble burst as jamming phase transition
Katsuhiro Nishinari, Mitsuru Iwamura, Yukiko Umeno Saito +1
Recently research on bubble and its burst attract much interest of researchers in various field such as economics and physics. Economists have been regarding bubble as a disorder i…
A statistical analysis of product prices in online markets
Takayuki Mizuno, Tsutomu Watanabe
We empirically investigate fluctuations in product prices in online markets by using a tick-by-tick price data collected from a Japanese price comparison site, and find some simila…