In response to a notice of termination and sales performance review from General Motors and ChannelVantage, a Michigan Cadillac dealership retained Anderson Economic Group (AEG) to provide an independent analysis for the dealership. The analysis specifically focused on 1) the factory’s assigned sales and service area, and 2) the methodology used to calculate the dealership’s Retail Sales Index (RSI).
To begin, we reviewed GM’s sales performance calculations and the methodology used by ChannelVantage to arrive at the dealership’s RSI score. Our Geographic Information System (GIS) was utilized to plot the location of the dealerships, its assigned Area of Geographic Sales and Service Advantage (AGSSA), nearby Cadillac dealers, and a ten-minute drive-time area from each dealer. The latter helped to identify census tracts within our client’s AGSSA that were more naturally and/or easily served by another dealer. Measuring the drive-time distances from each of center of these census tracts’ to nearby dealers aided in our revision of the assigned AGSSA. We next analyzed the demographics from the assigned AGSSA and the revised AGSSA, with a focus on variables that correlate with luxury vehicle sales, such as education levels, age, and income. We adjusted the RSI to account for our revisions to the AGSSA based on the reduction in the targeted demographic base, and a reduction in expected market share capture for the vehicle segment.
Our findings illustrated that our client had an unreasonably large market area, including over 20 census tracts that were located closer to other Cadillac dealerships. We also accounted for local demographics and customer behavior, as opposed to broad reaching assumptions based on state-level data, to estimate expected sales levels in the market. With these adjustments, we arrived at a significantly higher RSI relative to what GM determined, and used as a primary factor in termination the dealership. We compiled these findings in a report for the client, which he has shared with members of Congress while lobbying for passage of the Durbin-Hoyer bill that was enacted, and allows all terminated dealership a chance at arbitration.