Dong PI chat chan trong tuong lai se vuong minh toan cau .va se la dong tien ma hoa vung chat nhat thich hop. hoa dong. trong cong dong .do la the manh cua dong PI ma nhung dong tien ma hoa khac ko lam duoc .phu hop voi tung lua tuoi ko phan biet giai cap. Tu thanh thi den nong thon. dieu co the su dung .chi can co 1chiec dien thong minh la co the so huu dong Pi