trình bày ưu nhược điểm của thư tín dụng trả ngay không hủy ngang, thư tín dụng đối ứng, thư tín dụng giáp lưng, thư tín dụng chủ con. Cho ví dụ minh họa

Why is the type of product sold in an industry an important characteristic? a firm that can differentiate its product from that of rivals may be able to charge a higher price for a superior product. a firm that sells intangible goods is usually considered a monopoly. service industries cannot differentiate their products, which makes it easy for new firms to enter the industry. expensive products are usually sold by perfectly competitive firms.