Canada's ratable exchange (7)

I believe the answer is:

alberta

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'canada's' is the definition.
The answer and definition can be both locations as well as being singular nouns.
Perhaps you can see a link between them that I don't see?

'ratable exchange' is the wordplay.
'exchange' is an anagram indicator.
'ratable' anagrammed gives 'ALBERTA'.

Can you help me to learn more?

(Other definitions for alberta that I've seen before include "Beat Lar up in Canada" , "Canadian province, capital Edmonton" , "region of North America" , "Where is Jasper" , "part of Canada" .)

I've seen this clue in The Globe and Mail.

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