We estimate that American firms and consumers experience costs of almost $20 billion annually due to spam. Our figure is more conservative than the $50 billion figure often cited by other authors, and we also note that the figure would be much higher if it were not for private investment in...

Some online resources are free and others are not -- but it can be hard to predict which resources are in which category. In some cases, users are charged for things such as web-based e-mail, wireless Internet access, and software, while in other cases, they aren't. Zero prices offer important...

This paper compares the best selling books, cd and dvd on the French Amazon website to those of the Amazon Marketplace which connects professionals and non professionals (individuals) interested in new and second-hand cultural goods. We show that the catalog of the best selling items on Amazon...

This article reviews recent theoretical contributions on digital piracy. It starts by elaborating on the reasons for intellectual property protection, by reporting a few facts about copyright protection, and by examining reasons to become a digital pirate. Next, it provides an exploration of the...

Software market is considered as a new object for the mathematical economics. A statistical study of the server operating systems market is provided, static and dynamic models of for-profit and non-for-profit software developers mixed duopoly are built (taking into account market growth,...

Ample empirical studies in the e-commerce literature have documented that the price dispersion in online markets is 1) as large as that in offline markets, 2) persistent across time, and 3) only partially explained by observed eretailers’ attributes. Buying on the internet market is risky to...

We study and contrast pricing and price evolution of online only (Dotcom) and online branch of multi-channel retailers (OBMCRs) based on two panel data sets collected from online toy markets. Panel data regression analyses reveal several interesting empirical results: over time, OBMCRs and...

In two-sided markets where platforms are constrained to set non-negative prices, tying can be deployed by platforms as a tool to introduce implicit subsidies. For a monopoly, this raises participation and benefits consumers on both sides. In a duopoly, tying on one side makes a platform more or...