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.
In this respect, perfect competition and monopolistic competition are similar. Both perfectly competitive firms and monopolistically competitive firms earn zero. profits in the long run, since entry into (or exit from) the industry eliminates all. profits (or, in the case of exit, transforms losses to zero profit).