The feature of the average fixed cost is that it falls continuously but is never equal to zero. This means that as the quantity of production increases, the average fixed cost per unit decreases, but it never reaches zero. This is because fixed costs, such as rent and equipment, are spread out over a larger quantity of goods, resulting in a lower cost per unit. However, even if the quantity of production is zero, fixed costs still exist, so the average fixed cost cannot be zero.