Answer:
Wholesaler
Step-by-step explanation:
A wholesaler is someone that buys good in large quantities from the manufacturer or producer and sell it to the retailer or consumer. The wholesaler act as a middle man between product's manufacturer and the retailer. Wholesaler sells at a manufacturer's price which is always a fraction of what a retailer will charge on such good.
Gene acts as a wholesaler to his brother in-law steve who grows the tree (as a producer). He is the link man between the producer and the retail outlets