; and (B) a description of any problems relating to leasing, permitting, siting, or production. 6. Increasing economic certainty (a) In general The Secretary shall consider the total amount paid in acreage rental rates, capacity fees, and other recurring annual fees in evaluating existing rates paid by renewable energy projects for the use of Federal land. (b) Increases in base rental rates After a base rental rate is established on an issuance of a right-of-way authorization, for the entire term of the right-of-way authorization, any increase in the base rental rate shall be limited to the Implicit Price Deflator–Gross Domestic Product Index published by the Bureau of Economic Analysis of the Department of Commerce on the date of issuance of the right-of-way authorization. (c) Reductions in base rental rates The Secretary may reduce acreage rental rates and capacity fees for existing and new wind and solar authorizations if the Secretary determines— (1) that the existing rates— (A) exceed fair market value; (B) impose economic hardships; (C) limit commercial interest in a competitive lease sale or right-of-way grant; or (D) are not competitively priced compared to other available land