Black Friday: lifetime access is on a special offer in the app, until November 30. Black Friday: special offer on lifetime access, until November 30. Download
옵션의 시간가치는 투자 결정을 내리는 데 중요한 요소입니다.opsyeonui sigangachineun tuja gyeoljeong-eul naerineun de jungyohan yosoimnida.The time value of an option is an important factor in making investment decisions.