these differences can also be extended to the degree to which international prices will be passed through to the local market in urban zones that are more integrated into the international economy passthrough is more likely and they will have a larger proportion of net foodconsuming households if food prices rise by more than other prices then expenditure by the poorest population groups will be subject to greater relative inflation in fact data show that the rise in food prices seriously erodes the purchasing power of the poorest households for example in rural areas of el salvador households in were buying of what they bought months earlier for the same money