Industry WIKI

In popular culture, sets of precious substances may form hierarchies which express conventional perceived relative value or merit. Precious metals appear prominently in such hierarchies, but as they grow, gems and semi-precious materials may be introduced as part of the system. The sequences can provide interesting examples of the arbitrariness of semiotic signs.

Silver is a chemical element; it has symbol Ag (from Latin argentum) and atomic number 47. A soft, white, lustrous transition metal, it exhibits the highest electrical conductivity, thermal conductivity and reflectivity of any metal. Silver is found in the Earth's crust in the pure, free elemental form ("native silver"), as an alloy with gold (electrum) and other metals, and in minerals

In economics, a time-based currency is an alternative currency or exchange system where the unit of account is the person-hour or some other time unit. Some 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 r