In 1957, james vicary reported that subliminal messages in a movie reel ("eat popcorn") caused viewers to rush to the concessions stands. although his findings became famous, the problem is that

In the movie the phrase "eat popcorn" can be recorded backwards or be hidden into the lines of characters or in the music. So yes this is possible that there was a subliminal message telling the viewers to buy more popcorn.

i looked up you question and i found this on quizlet i hope this is one of your answer choices.

modern american cars are not available due to trade restrictions