ies conducted by the Federal agency.''; and (2) by adding at the end the following: ``(d) Adjustment of Payments.--The head of the lead agency may adjust, by regulation, the amounts of relocation payments provided under sections 202(a)(4), 202(c), 203(a), and 204(a) if the head of the lead agency determines that cost of living, inflation, or other factors indicate that the payments should be adjus