Motown's only pure "girl group" in the style of the shangri-las were also the prototype for the motown female groups of the 1960s, and had a hit song covered by both the beatles in 1964 and the carpenters in 1975. the are the

One drawback of voluntary trade is that it a.requires two groups to use a common language b.can make one group dependent upon another for necessary goods c.doesn't occur unless there is a shortage of goods for at least one group d.forces groups to rely on themselves to produce all the goods they need