Table 2: Unit root tests for food and eleven food product subgroups’ inflation rates.

CategoriesTotal period1997M01–1999M122000M01–2008M092008M10–2010M11
ρ-adjt-statadj. 1/2 lifeρ-adjt-statadj. 1/2 lifeρ-adjt-statadj. 1/2 lifeρ-adjt-statadj. 1/2 life

FoodS*−0.510.892.145.740.911.377.56−1.02
A*5.62−1.123.530.921.708.61

Bread and cerealsS0.49−0.67−0.320.795.123.00
A6.12−0.675.440.795.143.00

MeatS2.230.902.266.84−0.720.941.8911.64
A7.27−1.395.400.941.9911.15

VegetablesS0.88.863.060.812.643.220.778.282.70−1.04
A1.190.792.782.960.28−0.92

*S, A: Schwarz and Akaike information criterion for the selection of the lags number, respectively.