Final answer:
The average fixed cost curve is downward sloping, representing that as production quantity increases, the fixed cost per unit decreases. 'Spreading the overhead' means distributing the fixed cost over more output units, which reduces the average fixed cost per unit.
Step-by-step explanation:
A common name for fixed cost is "overhead." When this fixed cost is divided by the quantity of output produced, the result is the average fixed cost. If the fixed cost is $1,000, the average fixed cost curve will be downward sloping. This is because, as the quantity of output increases, the fixed cost of $1,000 is spread out over more units, causing the average fixed cost per unit to decrease.
What "spreading the overhead" means is essentially distributing the fixed costs across a greater number of output units. This sharing lowers the cost per unit as production volume goes up. Hence, the correct characterization of the curve is option (b) - the curve is downward sloping; Spreading the overhead means increasing fixed costs.