Consider a revenue-maximizing seller who can sell an object to one of n potential buyers. Each buyer either has hard information about his valuation (i.e., evidence that cannot be forged) or is ignorant. The optimal mechanism is characterized. It turns out that more ignorance can increase the...

This article contains a model of a practical conduction of empirical research with the use of the Delphi method deriving from the group of inventive methods. Research material includes tools which directly determine management and operation of contemporary economic organisations. Identification...