High barriers to entry means that a monopoly of a company has established in the market and other company have not getting the market share for the various reasons

1. The most important and foremost reason of it is start-up cost is very high which makes the market inaccessible to the other companies.

Other reasons are there

2. As the company is a loyal brand and the product are very much acceptable to the customers. For Example Coca-Cola- which is famous all over the world.

3. The company can sell its product lower than the average cost because of its large size and can earn profit from other outlets/branches.

4. The company may be the first one in this field. For example like Google 1^st one in the market of internet.

5.   The company may have the patent right- which means that the company has the exclusive righto sell their product and it is given to them by government.

Free entry and free exit means when the other companies can easily entry into the market and can increase the supply of the market and share the market profit with other companies in the market.

On the other hand, there is no barrier which can prevent a firm to leave the market when they are facing loss i.e. no fixed tenure or regulations for them.

So that the ‘high barriers to entry’ and the ‘free entry and free exit’ are the concepts of two opposite sides. One that emphasizes monopoly and the later ensures ‘perfect competition’.