The objective of this paper is to investigate by means of simulation t
he impact of third-party entry on the spatial separation of candidates
. Specifically, we do real-time simulations of Palfrey's (1984) model
of electoral equilibria with entry after relaxing some of its assumpti
ons. Our finding that the threat of third-party entry can induce virtu
ally the same spatial separation of the major-party candidates as entr
y with certainty is both a strong and interesting result.