Originally posted by Cattleman
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The grain industry in Ontario has been setting basis this way for waaay longer than I've been around. There they trade corn, soybeans and wheat - all with futures in USD - and all with cash prices in CAD. and every one of them set their basis as simply the difference between the cash price (in CAD) and the futures price (in USD). Here's a description of Ontario basis I found on the internet:
"Some people might say it's a moving target because the local cash price for corn, wheat and soybeans is the futures price adjusted for different factors such as the value of the Canadian dollar, freight, handling, storage, quality and localized demand."
Also, this way of pricing CAD-priced crops with USD futures is covered in any ag commodity trading course with the Canadian Securities Institute (the place where everyone in the financial industry takes their certification courses).
They do it this way because it makes things simpler. That's it. No malfeasance or "disregard for economic principles". Just like with your cattle pricing example, if you have a wheat basis contract with a buyer, you know exactly what the basis is (as with your cattle contract) and what the impact of currency changes will have on price (the difference is the impact of a change in FX does exactly nothing with the wheat contract, because you have locked in the FX by locking in the basis). When you hear futures are at X, you know exactly where you stand without having to do any FX math.
The price ends up being the same either way you calculate it. (It has nothing to do with Purchasing Power Parity or any other economic law/rule. It is simple math.)
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