I like the way the Niagara Falls Bridge Commission solved it for us. The toll used to be $2.50 US, $3.50 CDN. Based on the rise in the C$ in the spring, the commission raised the US charge to $3.00, attributing it to the decline of the US$. So when they reach par, the NFBC will reward us by raising the US$ toll to $3.50 instead of decreasing the C$ rate. Then when the C$ goes down, they will raise the C$ toll to compensate for the decline. An endless source of inflation for those who have a monopoly.