Which of the following most accurately explains why the supply curve for a good slopes upward to the right?
a. there is an inverse relationship between a good’s price and the amount consumers are willing to purchase.
b. there is an inverse relationship between a good’s price and the amount offered for sale by suppliers.
c. there is a direct relationship between a good’s price and the amount offered for sale by suppliers.
d. there is a direct relationship between a good’s price and the amount consumers are willing to purchase.

Special order carson manufacturing, inc., sells a single product for $36 per unit. at an operating level of 8,000 units, variable costs are $18 per unit and fixed costs $10 per unit. carson has been offered a price of $20 per unit on a special order of 2,000 units by big mart discount stores, which would use its own brand name on the item. if carson accepts the order, material cost will be $3 less per unit than for regular production. however, special stamping equipment costing $4,000 would be needed to process the order; the equipment would then be discarded. assuming that volume remains within the relevant range, prepare an analysis of differential revenue and costs to determine whether carson should accept the special order. use a negative sign with answer to only indicate an income loss from special order; otherwise do not use negative signs with your answers.