Wampum Wampum Wampum is a traditional shell bead of the Eastern Woodlands tribes of American Indians. It includes the white shell beads fashioned from the North Atlantic channeled whelk shell and the white and purple beads made from the quahog or Western North Atlantic hard-shelled clam. It was used by the northeastern Indian tribes as a form of gift exchange, and the colonists adopted it as currency in trading with them. Eventually, the colonists developed more efficient methods of producing wampum, which caused inflation and ultimately its obsolescence as currency. Wampum was often kept on strings like Chinese cash. Before European
Karl Shell the overlapping generations literature (and was perhaps the first to refer to the overlapping generations model by its modern name). The overlapping generations model is now a workhorse in modern macroeconomics and monetary economics. Karl Shell is also co-inventor (with David Cass) of the concept of sunspot equilibrium (and sunspots). Karl Shell Karl Shell (born May 10, 1938) is an American theoretical economist, specializing in macroeconomics and monetary economics. Shell received an A.B. in mathematics from Princeton University in 1960. He earned his Ph.D. in economics in 1965 at Stanford University, where he studied under Nobel Prize in Economics winner