At any time allotments are in effect under this subpart, the Secretary, from time to time, shall determine whether (in view of then-current inventories of sugar, the estimated production of sugar and expected marketings, and other pertinent factors) any processor of sugarcane will be unable to market the sugar covered by the portion of the State cane sugar allotment allocated to the processor and whether any processor of sugar beets will be unable to market sugar covered by the portion of the beet sugar allotment allocated to the processor.