Canada, 1931

"As a result the price of platinum fell from £22 an ounce in January to £13, 10s. in July. Unsettled conditions continued for nearly four years, so that with some fluctuations, the bottom price of $23 an ounce was reached in May, 1931. On the eighteenth of that month the price was raised to $27.50 and on June 8 to $40 an ounce."