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.

Does excluding food and energy prices from the Consumer Price Index (CPI) produce a measure that better captures permanent price changes? To examine this question, we decompose CPI inflation and “core” inflation into their permanent and transitory components, using a correlated unobserved-components model. The stationarity of inflation may be time-varying, so we examine the performance of the core measure of inflation separately for periods in which inflation is I(1) and I(0). For a period in which inflation appears to be I(1), we find that core inflation and the permanent component of overall inflation are closely related, but there are some caveats. For a period in which inflation appears to be I(0), we decompose the core and overall price levels and find that the permanent component of the core CPI is much more volatile than the actual core series and that the core excludes volatile permanent shocks to the overall price level.

This paper exposes the main issues involved in the development of a new and authentic Spain Consumer Price Index for the period of 1830 to 1936. The different sections in which it is arranged are focused on defining the field of study and scope to be analyzed, the sources and methodology used, as well as the similarities and differences in respect of other currently available indexes. It also contains a first and brief analysis of the results. The most outstanding characteristic of the new CPI from a long term perspective is its high stability, only once broken in a significant way during the 1914–1920 years, under the influence of World War I. The yearly growth rate for the whole of this period did not even reach 1 per cent, even though there was a change of level observed during the noted brief inflationary spike.

According to historiography, deflation was one of the main features of early 19th century Spanish economy. However, studies that quantify the intensity of this deflation in relation to the experiences in other countries are lacking. For this reason, the purpose of the paper is the construction and the interpretation of a Laspeyres index of consumer prices in Barcelona for the years 1775–1844. The paper is divided into two sections. The first part describes the method used to construct the index. The second section compares the evolution of Spanish prices with other international cases.