http://www.ips-journal.eu/regions/europe/article/show/myth-of-the-echo-chamber-2135/
https://www.bloomberg.com/graphics/2019-european-capital-markets/
https://www.cfr.org/blog/power-and-financial-interdependence
https://eml.berkeley.edu/~dromer/papers/RomerandRomerFinancialCrises.pdf