Final answer:
Offering sangrias and ritas by the pitcher has several benefits, including encouraging group sales for increased revenue, enhancing social atmosphere, and improving efficiency for service.
Step-by-step explanation:
The benefits of offering sangrias and ritas by the pitcher are rooted in the social and business practices started in ancient times, such as those at the symposiums in ancient Greece. By providing drinks in pitchers, establishments encourage group sales, which increases revenue. It also enhances the convivial atmosphere similar to ancient social gatherings, where sharing a common pitcher was part of the bonding experience. Additionally, pitchers are efficient for both the staff and customers, as they require fewer trips to the bar for refills and enable guests to serve themselves at their convenience.