Generally everyone knows what this is because it was taught to them as children. You should respect others in line and treat them as you would expect to be treated. Hold your place in line with your presence and do not cut in line. Do not rush the door when the sale opens. Do not block others from entering. Everyone has just as much right to be there as you, whether they are making a living at it or just enjoying a day out. If someone picks an item up, do not grab at it. If something is marked sold do not remove the sticker. Do not, hoard items you do not intend to buy. Honor your bids.