BTS J-HOPE's "Hope World", American fans' purchase self-control "published in the US economic journal" Forbes ".

* Presented at 10 o'clock Thursday U.S. time.

* Weekly statistics for "billboard" Friday 0 o'clock to 24 o'clock on Thursday. Thursday the statistics are divided into two weeks and distributed.

* Report that "strategic purchase" was possible with "purchase self-control" until Friday. .