Financial markets are overwhelmed by daily announcements. We use experimental asset markets to assess the
impact of uninformative communications on asset prices and trading volumes. We deliver uninformative
messages in standard experimental asset markets and find that trading volumes and prices are impacted by
these messages. In particular, the release of a pre-announced preset message to traders “The price is too high”
in predetermined trading periods decreases the amplitude and duration of bubbles. Also, the release of the
messages “The price is too high” or “The price is too low” reduces trading volume with inexperienced subjects
