Initially, Only People in Upper Socioeconomic Classes Could Afford Home

Initially, only people in upper socioeconomic classes could afford home decorators, but now with the service being offered free at home improvement centers like The Home Depot, nearly all homeowners can have personalized decorating advice. This illustrates the _____ concept.

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

Correct Answer:

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