The broker at deutsche bank quotes bid-ask rates of
Com for commercial sites), so this method was used. In very rare cases, U. sites have the country designation of us in their URL. However, these sites are the exception rather than the rule and there is no reason to believe that the exclusion of these sites from the study will cause a systematic bias in the sample. The domain name generated in this way may not be a valid URL, that is, such a website may not exist.