Giai thich cach cac spread ngoai hoi hoat dong, chi phi an xuat phat tu dau va cach chung anh huong den so tien duoc doi cuoi cung. Trinh bay cac cach thuc te de phat hien va giam chi phi spread khi doi hoac chuyen tien, va lam sang cac thuc hanh lam tron va dinh gia co the lam tang tong chi phi. Muc tieu giup nguoi xem nhan biet va tranh cac phi an thong thuong.
