In this case all of the cracks and crevices are sealed. Then a hole is put in the slab to install the small fan and create sub-slab suction. The average Radon mitigation cost in Portland, Oregon, or Vancouver, Washington is between $800 to $2,500 with an average of $1,200.
A central feature of monopolistic competition is that products are differentiated. There are four main types of differentiation: Physical product differentiation, where firms use size, design, colour, shape, performance, and features to make their products different. For example, consumer electronics can easily be physically differentiated.
1. Existence of large number of firms: The first important feature of monopolistic competition is that there is a large number of firms satisfying the market demand for the product. As there are a large number of firms under monopolistic competition, there exists stiff competition between them. These firms do not produce perfect substitutes.