who supplies variety of spring onion, green lettuce, chickpeas, kaylan, red spinach, bit root and lettuce is more appropriate to apply inventory policy of speculation as constrained by relatively long lead-time, and contrasted by the difficulty in predicting the demand level, despite consumer preferences that tend to stable. The long lead-time caused the supply chain is not sufficiently reliable. In addition, since the supplier B does not have a strong bargaining power so that he/she is likely affected by the fluctuations in the price. Then this supplier needs to anticipate the demand level that used to fluctuate. As for the other vegetable varieties, the proper inventory policy is postponement due to the relatively short lead-time, the supply chain can be assumed reliable in both amount of delivery and strong bargaining power.