Answer:
horizontal conflict
Step-by-step explanation:
A horizontal conflict is a type of distribution channel conflict between two or more companies that belong to the same distribution channel level.
In this case, both Roscoe Hardware and the other seller are both retail stores that sell their products to final consumers.
The conflict between them is caused by the extra cost that Roscoe has for carrying a stock of lawn mowers. Since the other seller doesn't have any type of lawn mower inventory, their costs are lower, therefore it can sell at a lower price. Probably the consumers go to Roscoe and decide what lawn mower they need and then go to the other seller and purchase it.