The element of the story which represents a product market in the circular flow model is "The lumber mill".
This is because the entire circular flow model of the product market is based on the lumber mill. The startup company is able to produce luxury furniture, after purchasing wood from local lumber mill. Then only different furniture items are made and sold.
Lumber Mill are used to produce Lumber and Oak Barrels from Wood and Oak Wood. Also known as sawmill, it is a facility where logs are cut into lumber. Modern saw mills use a motorized saw to cut logs lengthwise to make long pieces, and crosswise to length depending on standard or custom sizes.
Thus, the element of the story which represents a product market in the circular flow model is "The lumber mill".
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