Which of Porter's five forces is most closely associated with the concept "barrier to entry"?

Question

Quizplus · Accepted Answer

The concept of "barrier to entry" refers to the difficulty that potential new entrants face in entering a particular market. This is closely associated with the threat of new entrants, which is one of Porter's five forces. The stronger the barriers to entry, the lower the threat of new entrants, and the more attractive the market is to existing players.

Which of Porter's Five Forces Is Most Closely Associated with the Concept