Optimal Rent Extraction in Pre-Industrial England and France – Default Risk and Monitoring Costs



III.B. Stage Three: Theft and Enforcement

At stage three, the CA decides whether to monitor the agent or not and
the agent decides whether to steal or not. The payoffs determining the
monitoring and theft decisions are shown in
Figure 1.

Central Authority

Agent

Monitor

Not Monitor

Theft

П — t, t — C

πτ,    0

No Theft

π(θ)Nτ, θq(θ) - c

∏(θ)Nτ, θq(θ)

Figure 1. The Game between the Agent and the Central Authority

We assume that the agent has some wealth in addition to the revenues
he earns from stealing
πT , i.e., t>πT and that t>cso there are no
pure strategy equilibria of the game. We solve for the mixed strategy
equilibrium that would make the CA indifferent between monitoring
and not monitoring, and the agent indifferent between stealing and not
stealing. The threshold probability of theft that would make the CA
indifferent between monitoring and not monitoring,
μ, becomes

μ=C.                               (7)

In equilibrium, the higher the monitoring cost, the higher is the proba-
bility of theft.

The threshold probability of monitoring that would make the agent

indifferent between theft and no theft, γ , is equal to

2a - θ

γ = θ
γ       4tb

The CA’s expected profits from fees, πF , are in equilibrium equal to

πF = μγ(t - c) + (1- μ)γ(θq(θ)- c) + (1- γ)(1 - μ)θq(θ) =

= (1 - μ)θq(θ).

(9)


16



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