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.
Como se sabe, o DVD foi introduzido no meio dos anos 90 e era bem caro. Porém, pode-se ver que em 1998, ele caiu abaixo de U$400, e U$400 era um limite psicológico.