(1) The contracting officer shall insert the clause at 852.216-71, “Economic Price Adjustment of Contract Price(s) based on a Price Index,” in solicitations and firm fixed price contracts, subject to FAR 16.203-4(d)(1) and when changes to a price index will be used to calculate corresponding changes to the total contract price or unit As a requirement recurs or as quantity production begins, the cost risk should shift to the contractor, and a fixed-price contract should be considered. (e) Combining contract types. If the entire contract cannot be firm-fixed-price, the contracting officer shall consider whether or not a portion of the contract can be established on a firm-fixed-price basis. Other contract types include incentive contracts, time-and-materials, labor-hour contracts, indefinite-delivery contracts, and letter contracts. This wide selection of contract types is available to the government and contractors to provide flexibility in acquiring the large variety and volume of supplies and services required by agencies.