Before revision:  To this end, the paradigm of a pre-determined num\'eraire is abandoned in favour of a symmetrical point of view where all assets have equal priority. This approach yields novel versions of the Fundamental Theorems of Asset Pricing, which clarify and extend non-classical pricing formulas used in the financial community. Furthermore, conditioning on non-devaluation, each asset can serve as proper num\'eraire and a classical no-arbitrage condition can be formulated.
After revision:  Conditioning on non-devaluation, each asset can serve as proper num\'eraire and a classical no-arbitrage condition can be formulated.