What are the types of barriers to entry?

The types of barriers to entry are capital costs, competition, legal barriers, marketing barriers, limited market, predatory pricing, finding suppliers, master of technology, learning curve, and economies of scale. Barriers to entry aid the monopoly’s existence and allow the existing players to enjoy market power and market share.

How do barriers to entry deter new entrants from entering a market?

When barriers are considered to be high, it means that it takes a lot of resources to enter the market. Conversely, when barriers are considered low, it doesn't take as many resources to enter the market. An example of how barriers to entry deter new entrants from entering a market is the following:

What is an ancillary barrier to entry?

An ancillary barrier to entry refers to the cost that does not include a barrier to entry by itself but reinforces other barriers to entry if they are present. An antitrust barrier to entry is the cost that delays entry and thereby reduces social welfare relative to immediate and costly entry.

How did Stigler define an entry barrier?

In 1968, George Stigler defined an entry barrier as "A cost of producing that must be borne by a firm which seeks to enter an industry but is not borne by firms already in the industry." McAfee et al. criticized the phrase "is not borne" as being confusing and incomplete by implying that only current costs need be considered.