Time-Based Currencies
A particular kind of the Complementary Currencies, sometimes contrasted with Local Currencies
Definition
From the Wikipedia at http://en.wikipedia.org/wiki/Time-based_currency
"Time-based currencies value everyone’s contributions equally. One hour equals one service credit. In these systems, one person volunteers to work for an hour for another person; thus, they are credited with one hour, which they can redeem for an hour of service from another volunteer."
(http://en.wikipedia.org/wiki/Time-based_currency)
More Information
See the related entries on Complementary Currencies, Targeted Currencies, Local Currencies and Open Money