Cinematic exhibition of the B movie, defined as a relatively low-cost genre film, has declined substantially from the early 1980s to the present. Spurred by the historic success of several big-budget movies with B-style themes beginning in the mid-1970s, the major Hollywood studios moved progressively into the production of A-grade films in genres that had long been low-budget territory. With the majors also adopting exploitation-derived methods of booking and marketing, B movies began to be squeezed out of the commercial arena. The advent of digital cinema in the new millennium appeared to open up new opportunities for the distribution of inexpensive genre movies.