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Table 3 Estimated Pre-Antitrust sentence and Post-Antitrust sentence pasta producer price models

From: Antitrust intervention and price transmission in pasta supply chain

  Jan 2005-Aug 2008 Sept 2008-Sept 2013
  Estimate t Estimate t
  Rising semolina price coefficients
Current 0.768 5.48a −0.417 −3.57a
One month −0.016 −0.110 0.219 1.91c
Two month 0.591 3.92a −0.063 −0.530
Three month −0.029 −0.190 0.300 2.62b
  Falling semolina price coefficients
Current 0.493 1.52 −0.137 −0.68
One month −2.737 −6.81a 0.712 3.2a
Two month 0.891 1.95c 0.199 0.92
Three month 1.642 4.22a 0.009 0.06
  Other costs
Labour −0.002 −0.990 0.000 −0.500
Energy 0.000 0.380 0.000 0.260
Trend −0.001 −1.81c 0.004 3.37a
  Aggregate lagged effect
Sum of rising coefficient 1.314   0.039  
Sum of falling coefficient 0.288   0.783  
Differcenced 1.026 3.61a −0.745 3.65a
R2 0.92 0.88
Durbin-Watson 1.88 1.67
Sample size 44 60
  1. aStatistically different from zero at 1 %; bStatistically different from zero at 5 %; cStatistically different from zero at 10 %
  2. dDifference indicates the subtraction between the sum of rising coefficients and the sum of falling ones.