cameron

LOS ANGELES — James Cameron’s science-fiction epic “Avatar” has passed his “Titanic” to become history’s highest-grossing film, with a sizable boost from higher-priced tickets for 3-D and Imax showings. “Avatar,” like other contemporary films, has also benefited from the steady inflation of ticket prices —today’s average is $7.46, up from $4.69 in 1998 when “Titanic”