In particular the web giant is exploring hardware authentication options and experimenting with a device called YubiKey -- a USB-based token system.

ENGADGET

If the problem of small change led economists to understand how to run a system of token money, did some of the greatest economists of the early 20th century learn the wrong lesson from the system's success?

ECONOMIST: The lessons of sound money from 1,000 years' experience

By the same token, a constitutional reform may be aimed at fixing imperfections in the system of representation or other imperfections that demand amendments from the original constitutional document.

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