Data warehouses provide high fidelity leakage comparisons. These companies purchase data from credit card companies, business and other financial institutions to compile their leakage reports. The problem is they sell the data for an annual subscription price of $13,000 – far more than a humble EDC can spend. What to do?
Washington State has several regional economists working for the Department of Employment Security. A quick call to the northwest region economist teased out the idea of using per capita spending comparisons. While not as precise as what a data warehouse can provide, it can infer leakage.