@article {,
	title = {Transformation of a Regional Economy: Sociopolitical Evolution and the Production of Valuables in Southern California},
	journal = {Antiquity },
	volume = {65},
	number = {953-962},
	year = {1991},
	note = {cited by Dillian: shell bead exchange -- limited supply = higher value},
	author = {Arnold, Jeanne E.}
}