Self-Evaluation
The self-evaluation aspect of
multiple-value gives people freedom to register how
different transactions affect their welfare.
This self-regulation process avoids the conflict-imbued
dynamic of traditional
single-value scoring (prices), and
offers protection against manipulation by the powerful and unscurpulous.
The closest parallel to self-evaluation within the current
money system may be the sealed bids system
used to put in competing tenders for carrying out a contract.
Competitors' tenders are opened, and the contract given to the
lowest bidder. The sealed bid system works by stimulating
opposite desires within each bidder:

Counter-balanced pressures within the Sealed Bid system
The system of sealed bids, however, still works within a
single-value scoring system that
imposes a conflict between buyer and seller.
Altruistic Economics by contrast,
has no such tension, as it has no legal obligations to confound people's own morals.
People are free to meet whichever requests they wish - and the system of
sympathy means that, typically, they will prefer to deal with
people who are closer to them, whose self-evaluations they will be best placed to
interpret correctly.
Any system in which people are not free to make their own evaluation
of events will promote deception and thus distort relations between people.
Self-evaluation is therefore the only class of measuring systems
that can possibly avoid a systemic pressure to hide information.
Such a system of course gives people the freedom to deliberately mis-report
transactions' benefits in an attempt to cheat. This is why altruistic economics,
in an analagous way to the sealed bid system, is resistant against crude exploitation through
over-evaluation and
under-evaluation of the subjective value of a transaction.
People's ability to record one another's evaluations is one disincentive to deceitful conduct,
as is the backing of real-world social relations between participants.
Ultimately, it remains to be seen how people will respond to self-regulation,
but there is reason to believe it will prove more resilient than the scarcity-based
traditional money system.