On freedom of choice in pricing method, and in currency

I'd like to cross-post and request some peer review about this item from
the Payswarm's github site, dealing with a draft suggested payments system
standard requirement:

"A payments system standard shall respect and enable vendor freedom of
choice in pricing method, and in currency. Any vendor may implement fixed,
differentiated or indexed pricing. And any vendor may designate one or more
currencies in which to receive payment. Following from this, any purchaser
may issue payments in any of a vendor's designated currencies."

Details here:
https://github.com/web-payments/payswarm.com/issues/9#issuecomment-29155947

Significance explained in pgs 17-19 in:
http://library.mises.org/books/Friedrich%20A%20Hayek/Choice%20in%20Currency.pdf

Thoughts about this anyone?

-- 
Joseph Potvin
Operations Manager | Gestionnaire des opérations
The Opman Company | La compagnie Opman <http://goo.gl/Ssp56>