This paper presents results from a calibrated welfare model of the UK mobile telephony market which includes many mobile networks; calls to and from the fixed network; networkbased price discrimination; and call externalities. The analysis focuses on the short-run effects of adopting lower...

We propose a distinction between active waste and passive waste as determinants of the cost of public services. Active waste entails utility for the public decision maker (as in the case of bribery) whereas passive waste does not (as in the case of inefficiency due to red tape). To assess the...

Mobile telephony is described as a "two-sided" market where customers are seen as senders and receivers of communications that are mutually beneficial both to callers and receivers. This has implications in terms of market definition and market power. The economics of mobile call termination is...

We examine the relation between optimal venture capital contracts and the supply and demand for venture capital. Both the composition and type of financial claims held by the venture capitalist and entrepreneur depend on the market structure. Beside, different market structures involve different...

In a dynamic model of optimal security design, we show when firms should preserve "equity capacity" through choosing high target leverage or "debt capacity" through choosing low target leverage. Thereby, firms reduce a problem of underinvestment or overinvestment when they must raise future...

We analyze the role of different contract types and access regulation on innovation and competition in telecommunications in the context of Next Generation Access Networks. Within a standard duopoly model, we show that ex-post access contracts lead less often to the duplication of investment,...

An upstream supplier that is constrained both by downstream competition and the threat of demand-side substitution faces a tradeoff between maximizing joint-profit and extracting surplus. Although joint-profit maximization calls for relatively high marginal wholesale prices in order to dampen...

Firms frequently offer refunds, both when physical products are returned and when service contracts are terminated prematurely. We show how refunds act as a "metering device" when consumers learn about their personal valuation while experimenting with the product or service. Our theory predicts...

I take an efficient contracting approach to answer the question how much "job protection" to offer employees, in particular those at the top of organizations. Given their privileged information or formal authority, senior managers who are not given such protection are likely to take...

We consider an economy where production generates externalities, which can be reduced by additional firm level expenditures. This requires firms to raise outside financing, leading to deadweight loss due to a standard agency problem vis-à-vis outside investors. Policy is constrained as firms...