All of the following are assumptions of the perfectly competitive model except: Select an answer and submit. For keyboard navigation, use the up/down arrow keys to select an answer. a consumers have perfect information regarding product price, quality, and availability. b the output of one firm in the market is a perfect substitute for the output of other firms in the market. c the market consists of a large number of firms, and each firm is small relative to the entire market. d entry into the market in the long run is barred.

d

Explanation:

A perfect competition is characterized by many buyers and sellers of homogenous goods and services. Market prices are set by the forces of demand and supply. There are no barriers to entry or exit of firms into the industry.  

In the long run, firms earn zero economic profit.  If in the short run firms are earning economic profit, in the long run firms would enter into the industry. This would drive economic profit to zero.  

Also, if in the short run, firms are earning economic loss, in the long run, firms would exit the industry until economic profit falls to zero.  

Perfectly competitive market consists of a large number of firms, and each firm is small relative to the entire market. This makes firms unable to set the prices for their goods.

It is the monopoly and oligopoly market structure that is characterised by high entry and exit into the market

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