One possible reason is the loss of supply problems. Suppliers can raise prices in some special period. For example, when a problem occurs somewhere in the availability of goods, suppliers need to change the supply of goods, usually, suppliers to raise prices, so that restaurants need more food to normal operating costs, which will reduce revenue and may even lose money, in addition, affect our business, the second question is an internal financial problems. Managers can not be well controlled variable costs, such as cost of goods sold. For example, they only need to order two cases can be ordered, and the staff ordered four cases. For some commodities has expired, they will expire, so if they are overbooked and can not be stored for long periods, it will be wasted. So waste of money and a waste of cargo
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