Because this shirt fits like a glove

In a planned economy, which of the following does the job of market forces in order to determine the outcomes?

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Which of these marketing methods henry ford sell the model t to many people who had never before owned a car? a) offering free maintenance on cars for a full year b) airing television commercials with memorable slogans c) advertising with the new communication outlets such as radio d) offering many different colors and models for buyers to choose from