We analyze the success of filtering as a solution to the spam problem when used alone or concurrently with sender and/or receiver pricing. We find that filters alone may exacerbate the spam problem if the spammer attempts to evade them by sending multiple variants of the message to each...

I ringa utsträckning diskuteras graden av konkurrens. En förklaring kan vara, att konkurrensuppfattningen härrör från neoklassisk teori. En mera realistisk konkurrensuppfattning vinns genom att utgå från SCP-paradigmet. Med hjälp av detta paradigm kan urskiljas tre grupper av begrepp,...

Many countries that produce rough diamond have experienced a highly adverse pattern of economic development. In this article, we propose that the primary reason for the negative impact is that diamonds easily become the prize in predatory struggles between loot-seeking rebels and more or less...

In a non-cooperative oligopoly model where firms use simple linear prices, Klemperer (1987) has shown that the existence of consumers’ switching costs may generate monopoly like prices, and thereby create substantial loss in welfare. We show that when allowing firms to use two-part tariffs,...

System reliability is a key aspect of electricity supply, and the ability to maintain system reliability thus is an important aspect of a liberalised electricity market. But system reliability can be ensured only if there is sufficient reserve capacity at all times. In a liberalised electricity...

Law firms are expected to be controlled by the workers because given the diffculty of monitoring labor, the transaction cost would be very high and the essential human capital investment would be lacking in a firm controlled by the capital suppliers. Expectations are confirmed by the data....

We provide an analysis of corporate governance networks implied by members of board of directors of 319 companies listed in Istanbul Stock Exchange (ISE) for the year 2007. Our configuration yields a bipartite network for which we provide small world statistics in addition to the usual measures...

Access to external finance for small and medium enterprises is vital for survival and growth of such firms. In this paper we have analyzed the determinants of access to credit in microenterprises of Turkey. We use a unique dataset covering a large sample of microenterprises. We find that size...

The European Union’s Emissions Trading Scheme (EU-ETS) is so far the largest emissions trading system in the world. It covers about 12000 installations, representing approximately 45% of EU emissions of CO2, with the objective to establish a carbon price creating incentives for cost efficient...