XYZ common stock prices fell in a short period of time from $115 to $80. Which of the following investors probably made the most money? Gustavo took a short position in 1,000 shares of XYZ. Amy kept her money in high yielding saving account at the bank. John took a long position in 1,000 shares of XYZ. Mo used a margin loan to finance a 1000-share long position in XYZ. Dan shorted 1,000 shares of XYZ using a margin loan