Effort and Performance in Public-Policy Contests



to one player as the Low-Benefit (LB) player and to the other player as the High-
Benefit (HB) player3. The interest groups engage in a co
ntest that determines the
probabilities of approval and rejection of the proposed policy.4

Player i’s preferred policy is approved in probability Pri . The present
discounted value of this policy to this player is equal to
ui and its value to his
opponent player
j is equal to vj. By assumption then, for each player, approval of his
preferred policy is associated with a positive payoff, that is,
ui > vi . Note that, in
general, the four values
uL, vL, uH and vH, viz., the players’ payoffs corresponding to
the approval and rejection of the policy
I proposed by the government (a ruling
politician or a bureaucrat) depend on
I.

Let xi denote the effort of the risk-neutral player i. The expected net payoff of
i is given by:

(1)                     E(wi)=Priui(I)+ Prjvj(I)- xi , ij

Given the contestants’ efforts, the probabilities of approval and rejection of the

proposed policy, PrL and PrH , are obtained by the contest success function. As in

Skaperdas (1992), it is assumed that


d PrAχ-- χj )

xi


>0,


Pri (xi , x )

----λ i j,0 and

d xj


2 Pri (xi, xj )

χi 2


< 0 5 (the latter inequality ensures that the second order conditions are
satisfied). Since Pr
i(xi, xj )+Prj (xj , xi ) = 1 , ij , it holds that

(2)


2Pri(xi, xj)        2Prj(xj, xi)

xixj              ∂ xixj

3 See Epstein and Nitzan (2001a).

4 Modeling the contestants as single agents presumes that they have already solved the collective action
problem. The model thus applies to already formed interest groups.

5 The function Pri( xi , x ) is usually referred to as a contest success function (CSF). The functional
ij

forms of the CSF’s commonly assumed in the literature, see Nitzan (1994) and Skaperdas (1996),
satisfy these assumptions.



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