Antitrust intervention and price transmission in pasta supply chain

Agricultural and Food Economics

Table 4 Hypothesis tests^b of asymmetric pasta producer price response for Pre-Antitrust and Post-Antitrust

	Period	Jan 2005-Aug 2008	Sept 2008-Aug 2013
Rising semolina price coefficient vs falling semolina price coefficient	Current	0.54	1.51
	1^st month	39.2^a	2.79
	2^nd month	0.38	1.46
	3^rd month	15.41^a	0.21
Sum of rising coefficients vs sum of falling coefficients		13.09^a	13.33^a

^aStatistically different from zero at level of significance 1 %;
^bTests were conducted as F-test of the equality between the estimated parameters for increasing upstream prices and decreasing upstream prices