Basic stock levels (BSTOCK) increase over time with production (AGP) as adjusted for loss before reaching market (LOSS), decrease with demand or consumption (AGDEM),and adjust for exports (AGX) and imports (AGM).
This is the basic stock level only because the actual stock value (FSTOCK) is not allowed to go negative. If the basic stock level is negative, stocks are set at zero and a shortage (SHO) exists. If the basic stock level is positive there is no shortage and stocks equal the basic level.
