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Table 4 Hypothesis testsb of asymmetric pasta producer price response for Pre-Antitrust and Post-Antitrust

From: Antitrust intervention and price transmission in pasta supply chain

  Period Jan 2005-Aug 2008 Sept 2008-Aug 2013
Rising semolina price coefficient vs falling semolina price coefficient Current 0.54 1.51
1st month 39.2a 2.79
2nd month 0.38 1.46
3rd month 15.41a 0.21
Sum of rising coefficients vs sum of falling coefficients   13.09a 13.33a
  1. aStatistically different from zero at level of significance 1 %;
  2. bTests were conducted as F-test of the equality between the estimated parameters for increasing upstream prices and decreasing upstream prices