Rolled by Rewheel, Redux
The Finnish consultancy Rewheel periodically issues reports using mobile wireless pricing information to make claims about which countries’ markets are competitive and which are not. For example, Rewheel claims Canada and Greece have the “least competitive monthly prices” while the United Kingdom and Finland have the most competitive.
Rewheel often claims that the number of carriers operating in a country is the key determinant of wireless pricing.
Their pricing studies attract a great deal of attention. For example, in February 2019 testimony before the U.S. House Energy and Commerce Committee, Phillip Berenbroick of Public Knowledge asserted: “Rewheel found that consumers in markets with three facilities-based providers paid twice as much per gigabyte as consumers in four firm markets.” So, what’s wrong with Rewheel? An earlier post highlights some of the flaws in Rewheel’s methodology. But there’s more.
Rewheel creates fictional market baskets of mobile plans for each provider in a county. Country-by-country comparisons are made by evaluating the lowest-priced basket for each country and the basket with the median price.
Rewheel’s market baskets are hypothetical packages that say nothing about which plans are actually chosen by consumers or what the actual prices paid by those consumers were. This is not a new criticism. In 2014, Pauline Affeldt and Rainer Nitsche called these measures “meaningless”:
Such approaches are taken by Rewheel (2013) and also the Austrian regulator rtr … Such studies face the following problems: They may pick tariffs that are relatively meaningless in the country. They will have to assume one or more consumption baskets (voice minutes, data volume etc.) in order to compare tariffs. This may drive results. Apart from these difficulties such comparisons require very careful tracking of tariffs and their changes. Even if one assumes studying a sample of tariffs is potentially meaningful, a comparison across countries (or over time) would still require taking into account key differences across countries (or over time) like differences in demand, costs, network quality etc.
For example, reporting that the average price of a certain T-Mobile USA smartphone, tablet and home Internet plan is $125 is about as useless as knowing that the average price of a Kroger shopping cart containing a six-pack of Budweiser, a dozen eggs, and a pound of oranges is $10. Is Safeway less “competitive” if the price of the same cart of goods is $12? What could you say about pricing at a store that doesn’t sell Budweiser (e.g., Trader Joe’s)?
Rewheel solves that last problem by doing something bonkers. If a carrier doesn’t offer a plan in one of Rewheel’s baskets, they “assign” the HIGHEST monthly price in the world.
For example, Rewheel notes that Vodafone India does not offer a fixed wireless broadband plan with at least 1,000GB of data and download speeds of 100 Mbps or faster. So, Rewheel “assigns” Vodafone India the highest price in its dataset. That price belongs to a plan that’s sold in the United Kingdom. It simply makes no sense.
To return to the supermarket analogy, it would be akin to saying that, if a Trader Joe’s in the United States doesn’t sell six-packs of Budweiser, we should assume the price of Budweiser at Trader Joe’s is equal to the world’s most expensive six-pack of the beer. In reality, Trader Joe’s is known for having relatively low prices. But using the Rewheel approach, the store would be assessed to have some of the highest prices.
Because of Rewheel’s “assignment” of highest monthly prices to many plans, it’s irrelevant whether their analysis is based on a country’s median price or lowest price. The median is skewed and the lowest actual may be missing from the dataset.
Rewheel publishes these reports to support its argument that mobile prices are lower in markets with four carriers than in those with three carriers. But even if we accept Rewheel’s price data as reliable, which it isn’t, their own data show no relationship between the number of carriers and average price.
Notice the huge overlap of observations among markets with three and four carriers.
Rewheel’s latest report provides a redacted dataset, reporting only data usage and weighted average price for each provider. So, we have to work with what we have.
A simple regression analysis shows there is no statistically significant difference in the intercept or the slopes for markets with three, four or five carriers (the default is three carriers in the regression). Based on the data Rewheel provides to the public, the number of carriers in a country has no relationship to wireless prices.
Rewheel seems to have a rich dataset of pricing information that could be useful to inform policy. It’s a shame that their topline summaries seem designed to support a predetermined conclusion.