ECONOMIC ADJUSTMENT Beginning twelve (12) months after the effective date of this Contract and for every annual anniversary thereafter, the prices set forth in Exhibit B – Prices for Equipment Rental shall be adjusted, based upon the percent changes (whether up or down) in the United States Department of Labor, Bureau of Labor and Statistics (BLS) indices described below, for the most recent year. Economic adjustment shall lag one (1) calendar quarter past the Contract commencement date to allow for publication of BLS data. All calculations for the index shall be based upon the latest version of data published as of the most recent quarter. Prices shall be adjusted on the quarter following the price adjustment. Price adjustments will be made in accordance with the percentage change in the United States Department of Labor, Bureau of Labor and Statistics (BLS) Producer Price Index (PPI), for Construction, Mining, and Forestry Machinery and Equipment Rental and Leasing Industry, NAICS 532412, issued for the prior 12 months of each contract term. The percentage difference in the PPI for the prior 12 months will determine the maximum allowable adjustment of original contract prices. No retroactive contract price adjustments shall be allowed. If an index is recoded (i.e., the recoded index is a direct substitute for the prior index according to the BLS), this Contract will use the recoded index, as applicable. If an index becomes unavailable, Enterprise Services shall substitute a proxy index. If there is not a direct substitute, the next higher aggregate index available will be used. The economic adjustment shall be calculated as follows: New Price = Old Price x (Current Period Index/Base Period Index). Contractor shall not make contract extensions contingent on price adjustments.