No affect on prices; the prebate is intended to prepay the 30% sales tax on poverty-level consumption, keeping the poor from paying any taxes.
Except that the pre-bates adds about 3% to their inclusive rate.
BTW, welcome back.
Also, if the tax inclusive rate ends up at 19%, then the tax exclusive rate is not 30%, but 23.46%. Keep in mind the actual rate is not yet determined.