Question

When is it not necessary to build a new market supply schedule?

Answer 1

I believe the answer is: When there is a change in price

When there is a change in price, we need to re-arrange the quantity of our supply in order to make sure that we do not overstock.
Because the demand on the market became uncertain because of the price changing, building a market supply schedule during price change would be too risky.

Answer 2

Answer - When there is a change in price. A market supply is the sum of the supplies of all sellers. While a market supply schedule is a chart that lists the amount of a product all buyers in a market will purchase at different prices.