We consider option pricing when dynamic portfolios are discretely rebalanced. The portfolio adjustments only occur after fixed relative variation of the stock price. The stock price follows a marked point process and the market is incomplete. We first characterize the equivalent martingale...

The pattern of trade observed from firm-product-country data calls for a new generation of models. To address the unexplained variation in the data, we propose a new model of monopolistic competition where varieties enter preferences non-symmetrically, capturing both horizontal and vertical...

The paper discusses the relation between the justly famous Hotelling’s [1929] paper on stability in competition and the corresponding passages of the often ignored Launhardt’s [1885] book, devoted to mathematical economics. Launhardt is sometimes credited for the anticipation of...

We construct in this paper a "benchmark" model of fluctuations with optimizing households and firms. The economy is a monetary one, with imperfect competition in goods and labor markets, as well as increasing returns to scale and specialization. This economy is subject to technological and...

Recent human capital theories predict that labor market frictions and product market competition influence firm-sponsored training. Using matched worker-firm data from Dutch manufacturing, our paper empirically assesses the validity of these predictions. We find that a decrease in labor market...

This paper examines the impact macroeconomic policies in a system where the product market is modelled as an oligopolistic supergame in which potential entrants incur sunk entry costs. It is shown that policies which affect the interest rate, influence both the degree of competition in the...

In the theoretical literature, strong arguments have been provided in support of the efficiency defense in antitrust merger policy. One of the most often cited results is due to Williamson (1968) that shows how relatively small reduction in cost could offset the deadweight loss of a large price...

In this paper we propose an example of successive oligopolies where the downstream firms share the same decreasing returns technology of the Cobb-Douglas type. We stress the differences between the conclusions obtained under this assumption and those resulting from the traditional example...

Media industries are important drivers of popular culture. A large fraction of leisure time is devoted to radio, magazines, newspapers, the Internet, and television (the illustrative example henceforth). Most advertising expenditures are incurred for these media. They are also mainly supported...

This paper faces two questions concerning Joint Ventures (JV) agreements. First, we study how the partners contribution affect the creation and the profit sharing of a JV when partners’ effort is not obervable. Then, we see whether such agreements are easier to enforce when the decision on JV...