Which of the following is a stock?

The supply curve for products that can be made quickly without huge amounts of skilled labor and capital is usually________

Fill in the blank(s) with the appropriate word(s).

An increase in the price of good X causes the demand curve for good Y to shift to the left. We know then that

a. X and Y are complementary goods b. X and Y are substitute goods c. X and Y are inferior goods d. X is a normal good and Y is an inferior good e. X is an inferior good and Y is a normal good