Why doesn’t WolframAlpha display data on currencies purchasing power?

Questions
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1

I would guess that the most relevant and meaningful information about a currency would be its purchasing power history.

Why doesn’t that info show up in WolframAlpha when I query “US Dollar”? Is the data not available?

2

The Wolfram|Alpha team is always interested in suggestions for new functionality and new data sources. You can let them know by submitting feedback:

http://www.wolframalpha.com/contact.html

For financial data, it’s often hard to find a data source. And often those data sources don’t allow data to be used in certain ways.