Competitive Cyber-Insurance and Internet Security

This paper investigates how competitive cyber-insurers affect network security and welfare of the networked society. In our model, a user’s probability to incur damage (from being attacked) depends on both his security and the network security, with the latter taken by individual users as given. First, we consider cyber-insurers who cannot observe (and thus, affect) individual user security. This asymmetric information causes moral hazard. Then, for most parameters, no equilibrium exists: the insurance market is missing. Even if an equilibrium exists, the insurance contract covers only a minor fraction of the damage; network security worsens relative to the no-insurance equilibrium. Second, we consider insurers with perfect information about their users ’ security. Here, user security is perfectly enforceable (zero cost); each insurance contract stipulates the required user security. The unique equilibrium contract covers the entire user damage. Still, for most parameters, network security worsens relative to the no-insurance equilibrium. Although cyber-insurance improves user welfare, in general, competitive cyber-insurers fail to improve network security

Utility functions of equivalent form and the effect of parameter changes on optimum decision making

Equivalence class, Risk aversion, Sensitivity analysis, D81, D11, G11,

Public inputs and the credit market

This paper studies the impact of public goods provision in an adverse selection environment. Public inputs used collectively by firms have indirect spillovers in imperfect credit markets by affecting the random returns of borrowers in this market. Public inputs change the nature of the binding incentive constraint and mitigate distortions in the credit market. The magnitude of such indirect benefits depends upon the ‘type’ of the public input being considered. Public inputs targeted to benefit the less-efficient borrowers in the economy have greater indirect benefits as compared to pure public inputs that benefit all. These additional efficiency gains, emerging out of information-asymmetries in the credit market, should be considered in the cost-benefit analysis of such public inputs. Copyright Springer Science + Business Media, LLC 2006Public inputs, Incentive-constraint, Credit-market, Modified Samuelson rule,