In 2008, the trend line was much steeper than predicted and crossed the zero line. In the beginning of 2009, the trend reached the bottom and turned to a positive one, although not for long. The growth in food prices restarted in 2010 and has been in place since.In June 2011, the trend (black) line crosses the zero line in the end of 2010. Therefore, Figure 1 demonstrates that the difference between the core CPI and the index of food has been slowly approaching to its original trend (red line) since 2009.
Here we suggest that the intercept with the zero line and the pivot to the decreasing food price may start any time in 2011 or 2012 depending on the bottom (resistance) level. Since the previous negative/positive pivot was at the level of -10, as displayed in Figure 2, one cannot exclude that the negative trend may change only after 2016. This case is less likely, however.
Figure 1. The difference between the core CPI and the price index of food. The pivot point to a positive trend is likely in 2011 or 2012.
Figure 2. The difference between the core CPI and the price index of food between 1960 and June 2011.