Final answer:
The subject of this question is the relevant product market for Pool Line's pool cleaning system, which suggests the pool maintenance market where the company has achieved a significant market share and industry influence.
Step-by-step explanation:
The relevant product market in the context of the given information about Pool Line, the manufacturer of a highly effective pool cleaning system, refers to the market segment that focuses on pool cleaning systems. This market encompasses all the products and services used for the maintenance and cleaning of swimming pools. Based on the provided details, Pool Line has a significant market share, as indicated by the high percentage of new and replacement pool cleaning systems they sell.
These figures show the company's strong position and influence within the pool cleaning industry, and it may be inferred that Pool Line essentially represents the standard for such systems in the market. Moreover, the high level of recommendation by consumer magazines reinforces the company's standing as a leading provider in the pool maintenance market.