Congress gives agencies flexibility over the timing of spending by varying the period of fund  agencies may receive one-year, multi-year and no-year [permanent] funds.
Agencies need flexibility in the timing of funds so that they can make purchases when prices reach seasonal lows.
mnli hypothesis: Agencies need flexibility in the timing of funds so that they can make purchases when prices reach seasonal lows. premise: Congress gives agencies flexibility over the timing of spending by varying the period of fund  agencies may receive one-year, multi-year and no-year [permanent] funds.