泛孤艇东皋过遍,尚记当日,绿阴门掩。屐齿莓苔,酒痕罗袖事何限?欲寻前迹,空惆怅成秋苑。自约赏花人,别后总风流云散。忽逢青鸟使,邀入赤松家。When the demand for something is greater than its supply, producers and suppliers will sense the possibility of making a profit - the excess of revenues over expenses is the profit. |