After watching the video, I knew how the Sandstorm amasses money. They buy the gold in a fixed price and then sell it in a higher price. In other words, they use money to earn more money. Since they buy the gold in a fixed price, they can make sure that their customers’ profit even though the price of gold increases. That sounds irresistible to customers because they will only take a small risk. But at the meantime, I wonder how those companies who sell the gold to make a profit. If they sell the gold at a fixed price, can they earn money by doing so? Or the fixed price also depends on the situation, once the gold price goes up, it also goes up, but it still lower than its competitors price. Or they have easy access to raw material, so the fluctuation of gold price cannot influence them. Or the company itself is also a customer of Sandstorm, they can earn money with the help of Sandstorm instead of just selling the gold.