I sold 850 shares of Royal Dutch Shell on the 4th of October for $60.75. On the same
day, I predicted that this was the optimal day for both selling and buying the stock for this company to produce the maximum possible profit. So, also on the 4th, I bought 851 shares for $60.66. This ended up being 9 cents cheaper, making it possible for me to only purchase one more share than when the shares were sold.