How did summer get to be such a make-or-break season for Hollywood? It wasn't always this way, Corwin-Fuller Professor of Film Studies Jeanine Basinger recently told Marketplace, from American Public Media. “In the old days, the studio system rolled out movies,” she said. “I mean, let’s take MGM. In 1952 [it] put out a feature film every week, so for 52 weeks they rolled out 52 features.” In the 1940s, 80 percent of Americans went to the movies once a week. But with television gaining popularity, attendance had plummeted by the 1970s. Until 1975, when Jaws was released around the July 4th weekend. It…