Why we have minimum order quantity?

Why we have minimum order quantity?

As to the raw edged v belt including REC, REL, REP and timing belt, we need to cut each piece from a roll(sleeve) as below. We have to produce at least one roll(sleeve) at one time. A roll/sleeve has following quantity. That is why we have MOQ. If we have ready in stock, we can supply it. Then no need to produce a roll(sleeve).