The DVD, as you know, was introduced in the mid-1990s and it was quite expensive. But you can see that by 1998, it had fallen below 400 dollars, and 400 dollars was a psychological threshold.
DVDが1990年代の半ばに登場したのはご存じの通りです 当時は非常に高価でしたが 1998年には 400ドル以下になりました　400ドルは心理的な分岐点です