Electronic markets have grown rapidly in recent years. One of the largest markets on the Internet is the online auction platform eBay that is active in more than 40 countries and has more than 80 million active users. In order to reduce the problems caused by information asymmetries and...

The German federal government intended to alleviate the burden of increasing fuel prices by introducing a temporary reduction of energy taxes on gasoline and diesel. In order to evaluate the impact of this measure on consumer prices at the filling stations the development of procurement costs...