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 seperti yang kita tahu, diperkenalkan pada awal 90an dengan harga yang cukup mahal. Tapi Anda bisa lihat di 1998, harganya jatuh dibawah $400, dan $400 adalah batas awal psikologi.