Gold
In the old days before the gold standard was abandoned, one ounce of gold cost £3 17s 10.5d, or US$20.67, or 77.18 Scandinavian crowns.
That shows something about the inflation that has taken place since then. These days, a troy ounce costs £341, or US $683, or DKK 3740.
Perhaps I should go out and buy some gold…