Since Concerns About the Environment Have Appeared Simultaneously in Nearly

Since concerns about the environment have appeared simultaneously in nearly all of the social classes, recycled and recyclable products can be found in supermarkets, department stores, discount stores, and fashion boutiques. These retail outlets appeal to a variety of social classes. This illustrates the _____ concept.

A) trickle-up
B) trickle-down
C) trickle-across
D) trading-up
E) trading-down

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