In the wake of Realty Income Corp.’s (NYSE:O) announcement to acquire Spirit Realty Capital Inc (NYSE:SRC) in a $9.3 billion transaction, market watchers observed a roughly 5.4% decline in Realty Income’s share price. This downward movement has left some investors puzzled considering the news appears to be positive for shareholders. However, it's quite common for the share price of the acquiring company to slide after an acquisition announcement while investors weigh the potential pros and cons