1 ) A market maker faces the following demand and supply for widgets. eleven buyers are willing to buy at the following prices: $15, $14, $13, $12, $11, $10, $9, $8, $7, $6, $5. eleven sellers are also willing to sale at the same price. How many transactions must the market maker make if he wants to maximize his profits ?

a. 1

b.2

c.3

d.4

2) A market maker faces the following demand and supply for widgets. eleven buyers are willing to buy at the following prices: $15, $14, $13, $12, $11, $10, $9, $8, $7, $6, $5. eleven sellers are also willing to sale at the same price. If the market maker makes three transactions, what is his bid-ask spread per unit?

a. $4

b.$5

c.$6

d.$7