MEASUREMENT OF GROCERY PRICES: SOME METHODOLOGICAL CONSIDERATIONS AND EMPIRICAL RESULTS

This paper examines some methodological issues in the design and execution of food price surveys, and presents findings from a recent survey of fifty-eight grocery stores in the Cardiffarea. The methodology discussed includes the design of samples of goods to be surveyed (the ‘shopping basket’), of shops in which grocery prices are to be measured, and derivation of the shop-price matrices to be used in analyses of grocery pricing strategies. The empirical results show, as expected, significantly cheaper prices in multiple and co-operative stores compared with independent and affiliated. No significant difference is found between the latter categories of store. There is limited support for the hypothesis that the larger the store the lower the prices. Prices measured in the Cardiff area are also compared with average ‘shopping basket’prices derived from a national survey carried out concurrently by the Consumers' Association. Finally, the value to the researcher of ‘one-off’ price surveys is assessed.     

A Transaction Utility Approach for Bidding in Second-Price Auctions

In both the Vickrey and eBay auctions, bidding the reservation price is the optimal strategy within the conventional utility framework. However, in practice, buyers tend to bid less than their reservation prices, and bid multiple times, thus increase their bids, in the course of an auction. In this paper, we show that both underbidding and multiple bidding behaviors can be consistent with utility maximization, if buyer's utility incorporates a transaction utility (reference price dependent) component. Transaction utility is based on the difference between the buyer's reference price and actual price paid; it captures the perceived value of the deal. More specifically, we show that the optimal bid is lower than the reservation price, but higher than the reference price. Furthermore, buyer may re-bid (above the prior optimal level) if the reference price is revised upon observing a higher current price.     

The Consumer Costs of Food Certification: A Pilot Study and Research Opportunities

Certification labels have become a ubiquitous feature on food products across grocery store shelves. Although it is widely acknowledged that certified products often garner higher prices than their noncertified competition, less is known regarding what those price differences are based on, and what the personal, political, or ethical implications are for consumers. This research note argues for greater attention to the implications of certified food prices—which we conceptualize as the “consumer costs” of food certification. The paper discusses the theoretical linkages between food certifications and prices, and outlines the resulting consumer costs of which we are concerned. Through a pilot study in Salt Lake City, Utah, we investigate prices found on certified grocery store rice, and consider the causes and implications of the consumer costs of food certification.     

Prices Paid in Grocery Markets: Searching Across Stores and Brands

Using a large sample of prices paid for 21 homogeneous grocery products available in several brands in each of 16 markets, we simulate the search behavior of a consumer following different shopping strategies using as many as four supermarkets. We find that price search can lead to substantial savings. Brand switching can generate savings at least as large as visiting multiple stores to find the lowest price for a single brand. Buying a private label is usually a better way to save than any amount of search for low prices on national brands. A case study in a small metropolitan area grocery market yields results substantially the same as the simulation results.     

A cross-category investigation into the effects of nine-ending pricing on brand choice

Retailers largely adopt nine-ending prices and these prices have attracted greater attention from researchers in marketing. Despite this increased interest, very few empirical studies have tried to quantify the effects of nine-ending prices on consumer actual behaviors. Those who have studied the behavioral effects of nine-ending prices have produced mixed findings. In this article, we investigated the cross-category effects of nine-ending pricing on consumer brand choice at the SKU level. We distinguished between different types of nine-ending while controlling for the rounded prices and other marketing-mix variables. We conducted our analysis on over 11,000 SKUs in 102 product categories of two (2) grocery retailers. We find that the effects of 99 ending prices on the SKU's category choice are larger in concentrated and promotional categories but smaller in expensive categories. However, their influence on purchase quantity is larger in expensive categories but smaller in concentrated categories.     

Investigating the unobserved heterogeneity in consumers’ sensitivity to the price of gasoline

We empirically examined how gasoline prices impact consumers’ shopping behaviors. Using individual panel data on gasoline transactions, we found that gasoline prices generally have a statistically and economically significant impact. However, our disaggregate analysis indicated that, across consumers, considerable heterogeneity was present in the underlying sensitivity to the price of gasoline and in the income effect, resulting from fluctuating gasoline prices. More interestingly, the significant effect of gasoline prices was largely driven by the consumers with large purchase volume, and consumers with the highest level of gasoline consumption remained almost perfectly insensitive to the price of gasoline. Such heterogeneity is also present in the effect of gasoline prices on grocery expenditures, and notably, consumers with the largest purchase volume were not associated with statistically significant changes in grocery expenditures. Theoretical background suggests that the financial constraints of consumers and primary vehicle use may explain about the differences in responses to gasoline prices. Results based on individual-level data allowed for a comprehensive understanding of how and how much gasoline prices affect consumer behaviors and showed that inelastic gasoline demand and the considerable income effect due to gasoline prices may not best describe the effect of gasoline prices.     

Quantity Surcharges: Are They Important in Choosing a Shopping Strategy?

Instead of making value-price comparisons for all members of a product set, consumers may decide to adopt simple purchase decision rules such as larger sizes are better buys. When the unit price of a larger size is greater than the unit price of a smaller size, a quantity surcharge exists. Previous research has established that consumers do frequently encounter quantity surcharges in purchasing grocery products. However, estimates of the amount of the surcharge, the goal of this research, have not previously been reported. In this study the expected return from using the larger-size rule was estimated. The estimation procedure made use of price and size information gathered for all available packages of 23 products sold in 15 grocery stores in one rural Illinois community in October 1981. Nineteen of the 23 grocery products were found to have surcharges, with the mean amount ranging from less than one cent to 65 cents. Tuna fish was the only product for which the expected value of the return from buying a larger size rather than a smaller size was negative. Implications for consumers' choice of shopping strategies are discussed.     

The influence of seller strategy on the winning price in online auctions: A moderated mediation model

This paper examines the impact of seller strategy on winning prices in online auctions. In our conceptual model, three strategic choices made by the seller - minimum opening price, auction length, and use of a hidden reserve price - are mediated by the number of bids placed during the auction and moderated by product type. Our tests analyze eBay auction data for four consumer products through two matched studies (two products per study). In particular, we compare products for which value is easily determined with those for which value is less clear. Overall, we find strong evidence of the effects of minimum opening price and hidden reserve prices on final winning prices. The impact of auction length on winning price is less clear. In general, our tests support the idea that potential buyers rely more on signals such as opening price and reserve price for products for which reference prices are less available.     

Consumer price knowledge before and after the euro changeover

This article examines how the price knowledge of Finnish consumers has changed since the adoption of the euro. Our study measures price knowledge by comparing consumers’ price estimations with actual market prices at two points in time: before (October 2001) and after (March 2002) the changeover to the euro. Furthermore, we study potential differences between three different age groups. We approach the issue using four determinants, namely (1) response percentage (the percentage of respondents who were able to give a price estimate); (2) the difference between the median of the market prices and the median of the price evaluations; (3) the difference between the average of the market prices and the average of the price evaluations; and (4) the average of the absolute deviations between the average of product prices and consumer price evaluations. Our results indicate that, on average, consumers know the prices of grocery products quite well despite the prevailing dispersion of actual prices in the market. Price knowledge was found to be rather good both before and after the introduction of the euro. Nevertheless, the good price knowledge after the changeover was probably because consumers remembered the prices asked in the old currency and converted them to euros. The majority of respondents were able to give price estimates that were within the range of actual price dispersion in stores. The results also show some deterioration in price knowledge after the advent of the euro. There was variation between different age groups, and it seems that the introduction of the euro has affected various groups differently. Consumers aged 30–50 years knew prices best both before and after the euro, whereas the ability to estimate prices had declined most among consumers above 50 years after the euro changeover.     

The Role of Price in the Behavior and Purchase Decisions of Compulsive Buyers

The present research examines the relationship between consumers’ tendencies to buy compulsively and their response to price based on a survey of customers of an Internet clothing retailer. The research findings suggest that compulsive buyers possess greater knowledge of store prices and are more brand conscious and prestige sensitive in comparison with non-compulsive buyers. Moreover, compulsive buyers derive greater transaction value from price promotions and are more price conscious and sale prone than non-compulsive buyers.     

Information Technology and Consumer Search for Health Insurance

We explore the impact of information technology on the level of premiums paid for individual health insurance by asking which kinds of buyers will have larger gains from the use of new technology. We compare ‘asking price’ data posted on an electronic insurance exchange with survey data on premiums actually paid before the advent of exchange and examine whether the pattern of differences between asking prices and transactions prices can be explained using a simple search theory. We hypothesize that older consumers, expecting to pay higher premiums for a given policy, had engaged in more intensive search than younger consumers, given the same distribution of prices and search costs. Therefore, the introduction of an electronic exchange that lowers the cost of search should have a larger effect on decreasing the level of premiums paid for those who previously searched less (i.e., younger consumers). We find evidence consistent with this hypothesis.     

Development of Finns’ price knowledge after the changeover to the euro

This longitudinal study examines the 2002 changeover to the euro in Finland in order to find out how long it takes consumers to learn grocery prices in the new currency. We are especially interested in the influence of age on the process. We used price estimate data and market price data, with six data-collection points over 5 years, the first one just before the changeover and the last one 5 years after it. As expected, consumer price knowledge was clearly weaker immediately after the changeover than during the era of national currency. However, it has not improved significantly in 5 years. The probable reasons for the decreased price knowledge are the diminution of nominal values brought by the changeover (1 euro equals approximately 6 Finnish marks) and general indifference to prices, especially low ones, brought by the increasing standard of living.     

Individual differences in price responsiveness within and across food brands

Various researchers have reported that in routine grocery shopping the quantity consumers buy varies little across shopping occasions. Even in the presence of promotions, the largest part of promotional sales peaks has been attributed to brand switching. Recent investigations, however, indicated that the quantity consumers buy may include complex intra- and inter-consumer and intra- and inter-brand choice patterns. Using panel data from more than 1500 British consumers purchasing four food products during 52 weeks, the present study examined whether such complex patterns occur and assessed their relative contribution to overall quantity elasticity. Results showed that consumers buy larger quantities when paying lower prices, both within and across brands, and that consumers who buy larger quantities tend to pay lower prices, both within and across brands. The results also indicated that intra-brand price variations, especially those associated with consumers switching across package sizes, account for the largest portion of changes in quantity. Methodological differences might explain discrepancies among previous findings such as the duration of the sample used, the number of brands examined, and the conceptualization of a brand as including or excluding different package sizes.     

Actual and perceived consumer vigilance in the retail grocery industry

Economic theory suggests that price competition is in part driven by actively searching buyers. An exploratory study in a major midwestern grocery market revealed that executives responsible for pricing decisions overestimate the size of the price-driven shopping segment. The reasons behind this perception and its impact on pricing decisions are examined.     

Prices and promotions in U.S. retail markets

We provide generalizable results on the price and promotion tactics employed in the U.S. retail grocery industry. First, we document a large degree of price dispersion for UPCs and brands across stores, both nationally and at the local market level. Base price differences across stores and price promotions contribute to the overall price variance, and we show how to decompose the price variance into base price and promotion components. Second, we document that a large percentage of the variation in prices and promotion tactics across stores can be explained by retail chain and especially market/chain factors, whereas market factors explain only smaller percentage of the variation. Third, we show that the chain-level price and promotions similarity can be explained by similarity in demand. In particular, a large percentage of the variance in price elasticities and promotion effects can be explained by retail chain and especially market/retail chain factors. Further, price elasticities and promotion effects across stores of the same chain are hard to distinguish from the chain-market-level mean, and cross-price elasticities are typically imprecisely estimated. These findings suggest that retail managers may plausibly consider price discrimination across stores to be infeasible.

     

Consumer attitudes and loyalty towards private brands

Private or store brands improve the efficiency of consumer decision making by offering equivalent quality products at lower prices. The present study evaluated consumer attitudes towards private brands with the goal of understanding their appeal in order to enhance efforts to convince more consumers to buy them. We used three samples (ns = 279, 245 and 305) of US consumers to compare attitudes of buyers of private and national brands in three product categories: orange juice, cereal and bottled water. The results show that private label buyers (23% of orange juice, 6.5% of cereal and 14% of bottled water buyers) consider brands themselves to be less important and private brands to offer better performance than do national brand buyers. When asked about specific brands, national brand buyers tended to be price insensitive towards national brands, and private label buyers price insensitive towards store brands. In addition, the national brand buyers saw some of the national brands to be more relevant to their lifestyles and needs, but the private label buyers saw the private labels the same way. Being relevant to consumers' lives appears to influence brand selection. Besides touting lower prices, private brand promotions might stress the equivalent performance of private labels and create promotions showing how these brands can be relevant to consumers' lifestyles and needs.     

THE FREQUENCY OF QUANTITY SURCHARGES: REPLICATION AND EXTENSION

Widrick's research has established that larger sizes of grocery products are not always less expensive per unit than smaller sizes, or that quantity surcharges exist. The purpose of this research was to validate and extend Widrick's work. In this research, the overall incidence of quantity surcharges was 18.6%. Surcharges were found to occur more often when numerous brand sizes were offered and non-integer package size comparisons were required. Additionally, personal care products, not previously included in quantity surcharge research, were found to have a lower incidence of surcharges than food and laundry products. The research indicates there may be possible payoffs to consumers who make unit price comparisons rather than employing the economy size rule.     

Consumers’ multifaceted deal knowledge in a grocery retail setting

Despite its relevance to retailers, studies of consumers’ deal knowledge have been few. This study explores consumers’ deal knowledge before, during, and after the store visit applying a between-subjects field-study design with 1204 respondents. In particular, the authors investigate perception of deal price status, typical deal price knowledge, and deal-spotting ability. Results show reasonably stable knowledge of typical deal prices, while knowledge of deal price status and deal-spotting ability improves significantly during grocery shopping. Surprisingly, consumers’ deal knowledge is not conditional on purchasing a special thus indicating that most consumers, consciously or unconsciously, scan for promotion signals when shopping groceries. In addition, the results suggest consumers are not easily fooled, as the vast majority is able to spot ‘good’ and ‘bad’ deals, while also possessing typical deal price knowledge. Furthermore, the findings suggest that consumers store internal reference deal prices. Retailers are therefore well advised to consider mixed depth and creative discount patterns to prevent ‘perfect’ perceptions of typical deal prices.     

The effect of buyer feedback scores on internet auction prices

One of the major roles of Internet intermediaries is to help build trust between buyers and sellers for efficient and safe transactions. The buyer feedback system started in online auctions as one of the trust‐building mechanisms on the Internet. As the buyer feedback system is becoming a standard trust‐building mechanism in other e‐commerce sites as well as in online auction, there is an increasing interest about the impact of the buyer feedback system. On the top of recent studies investigating the effects of buyer feedback scores on auction prices, we provide empirical validations using more sophisticated methods. In this study, we tested the relationship between buyer feedback scores and bidding prices using an empirical data set from a leading consumer‐to‐consumer (C2C) Internet auction site. Data analysis results show a strong empirical validation of previous studies. Negative feedback is a significant price discount factor in the final auction price on the C2C Internet auction market. The results also show that potential buyers are more sensitive to negative feedback when they are considering buying inherently risky products such as used or refurbished products.     

Price competition with repeat, loyal buyers

Extant theoretical models suggest that greater consumer loyalty increases a firm’s market power and leads to higher prices and fewer price promotions (Klemperer, Quarterly Journal of Economics 102(2):375–394, 1987a, Economic Journal 97(0):99–177, 1987b, Review of Economic Studies 62(4):515–539, 1995; Padilla, Journal of Economic Theory 67(2):520–530, 1995). However, in some markets large, national brands that are able to generate more consumer loyalty than their rivals offer lower prices and promote more frequently. In this paper, we develop a two-period game-theoretic, asymmetric duopoly model in which firms differ in their ability to retain repeat, loyal buyers. In this market, we demonstrate that it is optimal for a firm that generates more loyalty to offer a lower average price and promote more frequently than a weaker competitor. Numerical analysis of a more general infinite period version of this asymmetric model leads to three additional results. First, we show that there is an inverted-U relationship between a weak firm’s ability to attract repeat, loyal consumers and strong firm profits. Second, we show that the relative ability of firms to attract repeat buyers affects whether serial and contemporaneous price correlations are positive or negative. Finally, we highlight the effect of dynamics on firms’ expected prices and profits.