Reference

Paul Beaudry, and Franck Portier, Stock Prices, News and Economic Fluctuations, American Economic Review, vol. 96, n. 4, September 2006, pp. 1293–1307.

Paul Beaudry, and Franck Portier, Stock Prices, News and Economic Fluctuations, NBER Working Papers, n. 10548, June 2004.