Unlike music and film, nearly all television is free at the margin: once a household has paid its subscription, it costs nothing to watch another show.
与音乐电影不同，几乎所有电视节目边际费用都是零：用户一旦付费订购了，看别的节目就不用掏钱了。
2
After all, digital film -flash memory -was a low margin proposition even if you had the huge fabs needed to produce it.