agent A's activities are not transmitted through the market (technological externality)

An externality is an effect of a person or firm's activities on the wellbeing of a third party that is not part of the market transaction. Technological externalities refer to the effects of technological activities that do not appear in the market. For example, Agent A may be conducting research and development on new technology, or researching new innovations that are not yet known to the market. In these cases, Agent A's activities would not be transmitted through the market, as there would be no value associated with them. It would be impossible to track the changes or effects these activities have, as the outcomes may not even be realized yet.