An economic factor
that makes it difficult for a business to enter a market
and compete with existing suppliers.
"Strictly speaking, a barrier to entry is a condition that makes the long-run costs of a new entrant into a market higher than the long-run costs of the existing firms in the market; a good example is a regulatory limitation on entry. The term is also used, more questionably, as a synonym for heavy start-up costs."
- Richard A. Posner
, Economic Analysis of Law, 10.8, at 227