Money supply. In economics, the money supply (or money stock) is the total amount of monetary assets available in an economy at a specific time. There are several ways to define money, but standard measures usually include currency in circulation and demand deposits (depositors' easily accessed assets on the books of financial institutions).
Smallpox (Variola). Smallpox last appeared in Australia in 1938, and the last case naturally occurring cases in the world was reported from Somalia in 1977. The virus is now only held officially in two secure laboratories.
The cactus moth was first introduced to Australia in the 1920s as a biological control for prickly pear cactus. Later, the cactus moth was introduced to the Caribbean Islands and was first reported in the U.S. in the Florida Keys in 1989 where it may have hitchhiked in on ornamental cacti from the Caribbean (MSU 2009).hrough the loss of Opuntia cacti, the cactus moth threatens native habitats and agriculture. Prickly pear is a source of food for birds and wildlife and represents a major plant genus of desert ecosystems in the southwestern U.S. and Mexico.