viewership on DVDs must be weighted since they never know how many times or how many people watch the save DVD. this is an understatement of viewership and may overstate criminal behavior.
moreover, it is unknown how many times a DVD is purchased because one is scratched. this causes duplicate purchases and overstatement of distribution.
finally, resale of used DVDs takes a bite from the market. It undermines market counts.
trailers may delay good DVDs, or decrease purchases of bad DVDs because they prime customers good or bad.
either way, the econometric models MPAA uses are neither transparent or accurate.
"monkeys with wings are flying..." economics are typical of self-satisfying monopolists lobbying for favoritism.
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