Céline Bonnet

Impact of Cost Shocks on Consumer Prices in Vertically-Related Markets: The Case of The French Soft Drink Market

We develop a structural econometric model of the vertical contracts between soft drink manufacturers and retailers to assess the impact of taxes or changes in production costs on consumer prices. Using individual data on food purchases from a representative survey of 19,000 French households in 2005, we estimate consumer demand using a random utility approach. Among a set of possible vertical relationships, we select the model that best fits the data. We evaluate the pass-through rate of changes in input costs (sugar) or of taxes and show that the industry over-shifts cost changes or excise taxes to the consumers. This result challenges the belief that firms do not pass on the full extent of cost changes or excise taxes to consumers. Copyright 2013, Oxford University Press.

Organic Label, Bargaining Power, and Profit-sharing in the French Fluid Milk Market

The paper determines how the value-added created by an organic label is shared in a vertical chain among manufacturers and retailers. Using purchase data on the French fluid milk sector, we develop a structural econometric model of demand and supply that takes into account the bargaining power between manufacturers and retailers. Our results suggest that the organic label segment is more profitable, as it permits the existence of higher margins. Moreover, an organic label allows manufacturers to achieve more bargaining power relative to retailers, and hence to obtain a higher share of total margins. The econometric model is then used to assess the impact of an environmental policy in favor of the organic segment based on a mechanism of price support. Our results suggest that while a subsidy policy towards organic products benefits both manufacturers and retailers, a tax policy toward conventional products benefits manufacturers of national brands at the expense of retailers and manufacturers that provide the private labels. The benefits of such policies on the environment is relatively small. All such policies tend to increase the impact on global warming and land use, but reduce the impact on eutrophication, acidification, and energy use.

How to Set up an Effective Food Tax? Comment on “Food Taxes: A New Holy Grail?”

Whereas public information campaigns have failed to reverse the rising trend in obesity, economists support food taxes as they suggest they can force individuals to change their eating behavior and make the agro-food industry think more about healthy food products. Excise taxes based on the unhealthy nutrient content would be more effective since they impact more on unhealthy food products than VAT (value-added-tax) taxes. Taxes based only on junk food products would avoid perverse effects on healthy nutrient. However, as eating behavior of consumers is complex, a modeling analysis would allow to assess unexpected effects on other unhealthy nutrients or products.