ripple-down effect
n.β Β«Direct impact is based upon film-related jobs for everyone from electricians and carpenters, animal trainers and helicopter pilots to homeowners, caterers and restaurateurs. Whatβs called the βripple-down effectβ led to the estimates of $37 million for the county and $46 million for the city and county combined.Β» ββFilm crews pumped $37M into economy last year” by Mike Hodgson Lompoc Record (Santa Maria, California) Apr. 29, 2007. (source: Double-Tongued Dictionary)