Frankfurt.
The next speaker at Prosumer Revisited is Patrick Linnebach, whose interest is in trust in prosumption activities. In the first place, however, it is necessary to define markets: they can be described as a group of producers closely observing each other (though not the consumers directly) - this is a form of interaction-free sociality (as competitors do not directly interact, even though they're keenly aware of each other. This is distinguished from direct interactions, for example in cooperation or in financial transactions.