Answer:
Market Maker's Net Profit = $850
Explanation:
David will buy the 1,000 shares he wished to buy at the Market Maker's sell price of $34.85 (since he is buying from the Market Maker).
Alexis, will sell her 1,500 shares to the Market Maker at the Market Maker's buy price of $34.
Therefore, excluding any inventory effect, the Market Maker's net profit from David's transaction
= sales price less purchase price
= (1,000 * 34.85) - (1,000 * 34) (the other 500 units the Market Maker purchased from Alexis will be in inventory and will not be considered)
= 34,850 - 34,000
= $850.