This article investigates the extent to which national brand and private label (store brand) prices behave differently as food price inflation changes. Empirical tests using a range of indices support the hypotheses that rising commodity and fuel prices lead to relatively larger surges in private label prices. When food prices are rising or high, the average price difference between national brands and private labels shrinks. The findings have implications for understanding the welfare effects of private labels. Moreover, they suggest that food price inflation is stronger for low-income households as food prices rise.

The essential aims of this article are: (1) to measure the magnitude of the crisis of 1803-1805 in the two Castiles; (2) to analyse the causes and consequences of this crisis. Among the main conclusions of this essay we would like to underline: (a) the 1803-1805 crisis led to a fall in the population of Castile of about 15 per cent; (b) the severe rise in the price of grains in those years was due to the bad harvests and the sparse working capacity of the municipal grain stores, but more than anything else it was the collapse of the market for this produce as a result of the prohibition of removing grain; (c) government measures to deal with the crisis were numerous and relatively bold, but not very effective; (d) the strong mobilisation of the people disrupted the working of some of the basic institutions of the Ancien Régime.