Disney and James Cameron’s “Avatar: The Way of Water” snared an estimated $56 million during its second weekend in theaters, a 58% drop from its debut. A decline in ticket sales is common for blockbuster titles, with most seeing a 50% to 70% slip. This metric, known as the second-week drop, is often used as an indicator of whether a film will have longevity at the box office or may fizzle quickly. Films that fall less than 50% are expected to have solid, long runs, while those that top 70% are likely to see ticket sales continue to sharply decline as the movie fades from the public eye. “The second-weekend drop for ... (full story)