As per capita water supplies in many regions of the United States and the w
orld begin to decrease, a mechanism must evolve to transfer water to where
it is needed. Water markets have become increasingly popular with water man
agers and state officials as a means of allocating or reallocating this res
ource. Along the Rio Grande in Texas, a spot market for water has developed
that is very active, with all the attributes that a well-defined market sh
ould show. As a result, individuals from agriculture, municipalities, and i
ndustry have begun to rely on this market as a means to supplement shortfal
ls in their own supply.